If you have that kind of money go spent it, but as others have sayed you really need to cut back on some of the less important parts and get a good graphics card, with that kind of buget I´d get a 8800GTX hands down, all you really need for gaming is a good Processor, Ram, and a graphics card (and a good motherboard but on for 100$ should be fine), the rest is just extras.
If I had the money I´d be making one now too but there really are not that many high-end PC games coming out soon that I need to play, the next big thing for me will be Starcraft 2 which my PC will handle without a problem, still all the games (exept for Crysis) are coming to 360 so its a much cheaper solution for me, plus I´m sick and tired of checking weather a new game will work or not or weather I need to upgrade, so I´m gonna wait till quad CPUs are cheap enough to get a PC that runns games like Crysis smothly for 500-600 $(CPU,RAM and GPU) which will take a while so I´ll stick to consoles till then.
