changed video card to 8800GTS
Alright, if you're going to upgrade any majot parts on this, you should get the retail version, not OEM. Also, I recomend the Fatality Sound card because it has it's own dedicated RAM for sound.
The X-Fi is overrated. Onboard HD sound or any cheap 7.1 card that has support for EAX 3.0 (like the Audigy SE for example) is good enough.