someone help me please i am a newb


I am new to high(er)-end stereo, i was recently given a stereo system that I would like to start adding to. I have a Mcintosh C33 preamp into B&K ST140 stereo amp and dual 1218 turntable and i want to either 1)get a DAC to play my digital music catalogue stored on my dell inspiron 530 or
2)screw it and upgrade to a better turntable

I have a budget of ~$500-$750

that said, i would like to understand computer to DAC playback/setup...like, should i be concerned about the quality of my computer/usb output?...or does the DAC pretty much negate that?...and maybe some of you could suggest other things i need to think about, thanks
offskooring
no, just pointed out that the question / enquiry has 'audiophile' and 'high-end' written all over it.
lol Rok...sorry, i am a newb to owning and buying high-end...i am just now cramming in some reading since i want a DAC...and boy am i in for some reading
Offskooring

I apologize for my outbrust. Believe it or not, I sometimes engage mouth / keyboard before brain. Welcome to audio. It's wonderful and affordable. Happy Listening.
if you decide to go the dac route, i recommend a used minimax, available on audiogon for about $600 ish.

regarding turntables, arms and cartiridges in your price range, a rega, with rega arm is a good choice, but then what cartridge ?? depends upon taste.

i suspect i will get some bricks thrown at me for this, because grados may produce a hum, i would consider a cheap grado.