What to upgrade next.


This is my first foray into the forum other than reading other's post. I hope respondents will be kind! I am at the very low end of audiophile equipment and many of you may not think I am there yet when I list my equipment. The economy has become better for myself and I am looking to upgrade but not exactly sure where to go from here. I am sure I will receive many different suggestions so I plan on taking the one suggestion that I receive the most and employing it. My equipment is as follows: Denon AVRx 3500H as my integrated amp which is boosted by a Bob Carver Cinema Grand 5 which pushes 200wpc. This powers my Polk Audio RTiA7's which are my music floorstanders. When I started upgrading I chose the Polk's as they seem to punch above their weight. After months on this site I am unaware of many people who extol the virtues of the Polks so I am thinking this may receive the most as far as recommendations. I stream most of my music from my desktop and laptop. The desktop sounds like an airplane waiting to take off. I am not independently wealthy but am looking to spend between 2-3 thousand if necessary. The one thing that gives me the biggest headache at this point is music delivery as computers have glitches and my angina acts up when the music cuts out in the middle of Alex Lifeson shredding his axe. My music files range from bad copies of MP3s which are slowly being replaced to HD Audio files. Thank you for any suggestions.
dadork
dadork, you remind me of where I started, about 10 years ago, having a Marantz AVR/Polk home theater (with RT12s bought int he late 90s) in the basement rec room that we and our kids greatly enjoyed for movies and video games.  Kids moved along and I started to get back into music, first thing purchased was an Oppo universal player to spin those old cds that had been boxed up for years - lots of fun and mysteriously it made Netflix etc sound better too.  Next was speakers, my brother's unused Maggies, which in turn deserved more power, so in came a used 150wpc amp.  This was getting fun!  But then I moved, different sized listening room, and I wanted to try streaming, so got Tidal, then Roon, and a PS Audio PWD DAC and then their bridge.  Each step was as good or better than the last, but the Maggies never sounded right in my new tunnel of a room (11.5' x 20' vs old room which was 16' x 24') so on to the third set of speakers.  I could go on, but two things - buy used (everything mentioned so far was used) and have a plan and budget - you will be amazed at what you can do for $2-3k, I know bc I have done it.  Don't ever get overwhelmed by all the super high-end posters out here in Audiogon land, you can have great sounding audio and theater system for not too many $ if you research, plan, and buy used.  

Sounds like this posting has you off and running with a good plan.  Like mentioned a few times above, preamp with HT bypass will serve you well.  Also I can honestly say that at some point, look at and research room treatments - these will likely be your highest value ($/delta in SQ) you will get once you get to a $3-5k system.  When you get serious about speakers, and knowing demoing is not easy for you, really think about how best to describe what you'd like to hear more of, less of in your system, and what you don't want to lose, then read lots of speaker reviews and if possible call a few experts or visit a shop or two when you visit civilization (I think there's a great store in Ann Arbor?) - there are people out there who are happy to help a budding audiophile with their journey.

And never forget, it's about the music!  
As you are finding out, your source/streamer are going to rid you of glitches ! Then if you find one that has preamp function there you have tackled a second issue. Also buying used cds and converting them (DP Power) is far less expensive 4-6$ each on Ebay. So one smart purchase USED will get you well on your way. Then better speakers will help you hear the differences as you look to future updates! Buying used speakers will be limiting as shipping will kill the deal unless you are going stand mount. But then you can take day trips to audition speakers, which is a lot of fun and you get to meet like minded friends.
Oopwah - Has a good point. I believe you are referring to Dbpoweramp which is what I use to rip my CDs to computer.

I only buy CDs, I only download music if I just cannot find it on CD. Dbpoweramp converts it to FLAC, so I have a lossless copy and I have the CDs as backups.

Then Plex is my player, nothing like browsing music on a large screen TV. Select what I want and play. I occasionally use DLNA from my Oppo or preamp as well.

Will
@richbutters My God Man! My wife would kill me! Six systems? She doesn't fight me hard but even I couldn't justify six systems. Unless of course I hit the Mega Million and we all know how likely that is to happen. Hopefully I can make some wise and lucky picks and arrive at my destination without so many steps.
@thosb Thanks for your response. Most insightful. I am as you may be able to tell, very new to the subscription music service business. The move to Tidal my first ever as a matter of fact. So a couple of questions about your response. If I have Tidal and it's running through a Node 2i and I have the Hi-Fi subscription what would be the purpose of also having Roon or any of the other services? I can look up any artist I can imagine and pretty much listen to anything they've ever recorded right? It's already in FLAC so are there services that offer even higher definition? I've got a very few albums from HDTracks in 24Bit/194?kHz. I'm enjoying the simplicity of grabbing my phone and dialing up whatever I want without getting out a CD or pulling it up on my Laptop. Sans possible internet interruptions right now I'm in heaven. I need to learn a lot more about DACs I think. I know what they are just not why some are better and so much more expensive than others. The Node 2i is supposed to have a good DAC but I don't know what that means nor what the metrics are that differentiate. My Denon has a 32 Bit DAC . The Node is supposed to be better but then I have people who say I need to add an even better external DAC to that. How would an audio processor make the bass more distinct and punchy as some claim? Almost as if it's adding watts? I go through adds for speakers on this site and others (used of course) then go online and read user reviews then the online mag reviews. I've read reviews for speakers that range up to 200K which just boggles the mind. I was very impressed with reviews for the Silverline Sonatinas. They sound like everything I'm looking for. Of course I have no idea at all if they'd fit in with my system! I am really trying to figure out if I need to do some rethinking on the pros and cons of floorstanders or really good bookshelfs. Fidelity is the most important consideration. As I stated in an earlier post I am in an 11.5 x25' room. I like to be able to feel it as well sometimes and can't quite imagine bookshelfs being able to deliver that. Thanks for any more input!