Duke Gushington wrote:
If I can say one thing, spend the extra money to get a modular power supply. Sooooo easier to work with. I have the 750W Corsair and love it. And if your budget is more than $1k, then go for the AMD six-cores, otherwise the 955 and 965 black editions are solid. You really cant beat the AMD prices, cpu and gpu, and last I checked, AMD still had the best video cards around...just saying.
Duke is the second to last person to take computer building advise from... just saying. You haven't checked video cards in a while... 480gtx>5870 for straight gaming performance, few will argue otherwise. I do love you though, Duke. Though, there are benefits to the ATI line, such as lower temps, affordability, and 3 monitors with eyefinity. The 5870 (vanilla of sorts) is a good buy, just don't spend more than $420 on one. You'd be better off waiting for a 480GTX to drop in price a bit.
I will say, most what Duke says is correct. With a power supply, something certified and modular is a must. I would not expect you would buy otherwise with that budget. AMD Six-Cores are affordable and perform well (though almost nothing is using those extra 2 cores yet). Intel Core i7 is still a very solid buy if you get a socket 1366 and overclock the piss out of it on air cooling. You can get a 920 to from 2.66ghz to 4.0ghz on air, easy.
Contrary to what Teeter says, buy stuff with warranties and support, EVGA, Corsair, etc, especially if you have the money for it. There's a reason these guys are rated so highly on their products. Once you figure out the kinda market you're in, search for head-to-head comparisons of similar parts from either manufacturer (IE:ATI vs. Nvidia) and make your own decision. Once you get there, compare identical products from different manufacturers (IE:Sapphire 5870 vs. Gigabyte). I can't stress enough how much reading reviews is important, at least for me. I blueprinted my PC for a month or 2 before making the buy, waiting for sales and ensuring everything was compatible. Google is your friend

/fin