Since I'm a nub at PC gaming (obviously) and with PCs in general, links are nice. Maybe to their websites and stuff.
If you don't know much about computers, do Dell. You can really knuckle down and learn all the intricacies and blow a couple grand easy... or you can get yourself a decent priced machine for 1200$ or lower. If you get it on a good deal weekend, your looking at more like 800$.
I ended up this time and didn't want to hassle with building my won rig (Had done it multiple times before), so I called Dell. I would recommend. Most of their sales reps get commission, so they will be trying to cut you a deal.
Also, Bensbargains.com. This site posts daily deals for most sites. The good thing about it, is that it keeps track of coupon codes for most sites... so you can get a coupon code for 30% off something here, or 20% off there, it saves you a lot in the long run.
Another thing to consider, and I didn't know this but was corrected in the past, the difference in the amount of money you spend on a gaming PC or a console isn't terribly different in the long run these days. Especially considering the price of new consoles these days... and if you want to remain a loyal console player, you'll need to do that upgrade... is it this year the new generation comes out?