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
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.
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.
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
no, just pointed out that the question / enquiry has 'audiophile' and 'high-end' written all over it.
If you were truely a newbie, you would not even be asking or thinking about things like this. sounds as if you have been at least reading the high-end stuff for a while.
Sgunther:
-36years old
-I have 4 kids under 6 right now and working on paying off a mortgage in 5 years, that said, i think i could reasonably say~$5000 into my system seems reasonable
-i have no cable, no internet at home so when i do look for entertainment it is music or dvds. I would say 95% of h time i listen to music it is sitting in front of speakers with full attention on music, 5% background for reading/cleaning/playing with kids
-I honestly don't know how many LPs I have, i just started vinyl last winter...if i had to guess I would say ~50 that I listen to (then there is the crapload of "sing along with mitch" and big band records i picked up from my grandfather when he passed).
Here are a few questions that should help responders more accurately provide advise. How old are you? How much are you willing to spend on your audio system over the next five years/10 years? What percent of the time do you sit and listen to your system as a primary source of entertainment and what percent as background while doing other things? How many LP's do you own?
The Peachtrees are the best for the money with USB inputs. Make sure your files are lossless or better as Swampwalker stated. I have a Musiland MD-10 which is great for the money.
You haven't mentioned if your digital files are stored in a lossless format or the more common lossy MP3 format. If they are MP3s, the first thing to do (if you own the original discs) is to re-rip using something like JR River jukebox or Media Monkey in a lossless format like FLAC. Then I would recommend the HRT II+ USB DAC which costs $350 new and is powered off the USB bus so you can easily take it. I'd add a pair of decent RCA interconnects that you can buy used here for $100 and you would be good to go. The USB cable, to my ears, is not that important. If have some $ left over you might want to upgrade the interconnect btwn the pre and the power amp if its a basic freebie type.
Sorry...of course I meant---Don't let anyone tell you that you CAN'T get hi-fi from a computer.

anyway good luck...feel free to email me with questions about a pc/dac solution...be glad to share my experiences.
MY thoughts/opinions/experience... (you may get some polar opposite responses )....

The quality of your output on your pc...optical (if you have one)/usb, etc is kind of irrelevant...especially if you grab a usb to to s/pdif converter to tighten up timing... (even without this you can get amazing performance with a decent dac and lossless bit format).

This will spark debate--But IN MY EXPERIENCE, I've noticed Zero difference in performance of Digital cables (cheap vs. expensive)...in fact I have a/b 'd between my optical and coax dac outputs with very little sound difference...

For the kind of money your talking, I'm a huge fan of the PS Audio Dlink 3, it is a great performer...if you like warmth, body, etc (i.e. it's musical).... If you are a detail freak...there are better choices.

Don't let anyone tell you you can get hi-fi from a computer... I've got my "highest fi" using a computer and a great DAC. I will never go back to a CDP

YMMV.
You will notice a benefit to upgrading your turntable when you do it, but I suggest getting a DAC right now because you don't seem to have anything except your Dell's audio out jack for playing digital music.

So I say keep the turntable upgrade in mind and start researching it, but spend now on a DAC and cables. Personally I would suggest the SimAudio Moon 100D DAC. It has a USB input which you can use for now. You will have enough cash left over to buy a good USB cable, like the cryo-treated silver one from Audiogoner Acreyes -- look him up.

Later, to upgrade your digital sound, you will want a USB-to-S/PDIF converter (one like the Valab Tera-Link X which sells on eBay for $60), plus a 1.5 meter coaxial interconnect cable.

That's what I would do, and there will be others who have their own favorite approaches to your needs and budget.