Building a system from scratch (other than speakers)

Yes, yes, and yes.

Reading Stereophile and Audiogon forums, talking both by email and in-person with audio dealers, meeting with and talking to other audiophiles and with the actual designers and makers (Robert Lee of Acoustic Zen, Duke LeJeune of AudioKinesis, and Larry Staples of Living Sounds Audio are a few who come to mind) of some of the products. All these and a bunch of years experimenting with different components, configurations, cabling, rooms, and music.

I guess like any serious hobby, the more you immerse yourself in it, the more you learn. There's also the obligatory bunch of useless info and snake oil out there, but for the most part the people I've dealt with share a passion for good sound and an appreciation for others who share that passion.

Fyi
my Martin Logan's with the Emotiva preamp and mono amps was a really poor match.
Go to the Martin Logan forum for advise.
Two terrific used amps for your speakers are the Sunfire 300x2 and the Ampzilla if you can find rebuilt ones.  I found a newly reconditioned Sunfire 300x2.  Perfect match and $800 on eBay.
Be very cautious of tube amps with Martin Logan's very demanding low impedance.  
I found 100 watts minimum and more is better on my ML ESL's.  My ESL's drop to low 2ohms at some higher HZ .

Arisingsound-

you do not want to make a buying mistake. Take your time and travel to listen to the gear. You are not far from New Orleans- seek out Wilson Audio owned by Doug Wilson. He is a plethora of knowledge and a visit will yield a step in the right direction.

Keep me posted & Happy Listening!

Hello,

If you nee to purchase amp, preamp, digital source, and phono source, I agree with one of the posters above, I would look at a integrated amplifier for sure.  I would go heavier duty on the turntable/arm/cartridge than I would on amplification.  Usually the sources and the speakers are the most important.  I would also avoid the oppo CD player.

Not sure if this this enough power, but this integrated from Conrad Johnson ($1350) looks great:  https://www.audiogon.com/listings/tube-conrad-johnson-cav-50-tube-integrated-amplifier-2016-02-01-in...

This Krell sold state integrated is also worth considering, at the same price, it has significantly more power if your speakers need it.
https://www.audiogon.com/listings/solid-state-krell-kav-400xi-2016-01-25-integrateds-85701-tucson-az

Perhaps a little tube phono pre such as this one $700:
http://www.needledoctor.com/Pro-Ject-Tube-Box-DS?sc=2&category=36638

I would step it up a bit with the table and cartridge.  this $1000 table seems like a pretty solid deal.  Its a higher end table than the one you were looking at, and it even comes with a $450 cartridge, versus some $30 cheap starter.
link:  http://www.needledoctor.com/Pro-Ject-RPM-3-Carbon-Turntable?sc=2&category=352

This one on audiogon also looks interesting:
https://www.audiogon.com/listings/turntables-thorens-td-160-super-package-with-audioquest-pt-5-arm-a...

As for digital, personally, I would advise against a CD player.  The move to hard drive storage, digital player, and DAC is the way to go, and it is the way the industry is moving.  All you need to do is rip all of your CDs to a basic NAS hard drive with your computer.  Rip them in a lossless format such as WAV or AIF, and you will have fully uncompressed CD quality music, and you never have to worry about scratching another CD!  Cambridge makes a player called: Cambridge Audio Azur 851N that sells for about $1700; you may find it used for $1100?  Cambridge also makes a similar unit that is a step down the chain for about $1000. These are players that will access your networked hard drive, organize the music, and play it through its high quality DAC, and output to your amplifier.  For the price, these cambridge units (or similar ones from Marantz and Sony ES) is excellent.  They all have a smart phone / tablet app to control them, which is excellent, and also allow access to streaming services like Tidal.

NAS hard drive $160:
http://www.bhphotovideo.com/c/product/1007531-REG/wd_wdbctl0040hwt_nesn_4tb_my_cloud_drive.html

Amp 1350
Phono Pre $700
Table & Cartridge $1000
Digital $1000
NAS Drive $160
Cables $800

total $5000

Cables are a whole different topic of conversation.  You won't get the best available if you need speaker cables, and 2 pairs of interconnect for $800, but its a good starter budget.  definitely get used.  The cable company has a used section that is great, and of course Audiogon has a ton.  Hope this is helpful!

Good Luck,
Mark