Re: x1900gt and 7600gt
If I were you, I would wait. Yeah, there's a difference in the performance, but in reality, it's not that big. A 300 watt PSU probably won't power an x1900, from what I've heard, those things suck juice like crazy. You'd be better off waiting until after the release of some reasonably priced DirectX10 graphics cards, and then totally revamp your system.
C2D E6600 | 4GB DDR2-800 | 9800GTX+ | Asus P5B-E | 150GB Raptor | 320GB 7200.10 | 750W Xigmatek PSU