Alright then, $900 build with no OC?
Well, for $900 we certainly can do much better in the graphics department than what you have so far!
Case: Antec 900 Black ATX
MOBO: ASUS P5Q Intel P45
CPU: Intel Core 2 Duo E8400 @3.0GHz
HS: AC Freezer 7 Pro
GPU: VisionTek Radeon HD 4870 512MB
RAM: G.SKILL 4GB (2 x 2GB) DDR2-800
PSU: OCZ StealthXStream 600W
HDD: WD Caviar 640GB 7200 RPM
DVD?RW: LG 20X DVD?R[W] DVD Burner
Total Price: $885 USD (after Mail-In-Rebates, before Shipping)
Ho, ho! Much better!
If you'd rather you can even cut it this way, and add a Blu-Ray/HD-DVD drive!
Case: Antec 900 Black ATX
MOBO: ASUS P5Q Intel P45
CPU: Intel Core 2 Duo E8400 @3.0GHz
HS: AC Freezer 7 Pro
GPU: EVGA GeForce 9800 GT 512MB
RAM: G.SKILL 4GB (2 x 2GB) DDR2-800
PSU: OCZ StealthXStream 500W
HDD: WD Caviar 640GB 7200 RPM
DVD?RW: LG 20X DVD?R[W] DVD Burner
Blu-Ray: LG Blu-Ray/HD-DVD Combo
Total Price: $855 USD (after Mail-In-Rebates, before Shipping)
Either setup mentioned above will be more powerful then the system in your cart so far.
If you decide just to ignore this post, that's fine, I would just say at least swap out that PSU of yours for the either one of the ones listed above. Both are better PSUs then the one you have in your cart, as they have more amps on the 12V line, are more efficient, are quieter, and cost less!
Also if you're going to bother with an upgraded heat sink, don't forget to get some good thermal compound and remover.
Thermal Compound: Arctic Silver 5
Compound Remover: AS Thermal Remover
Adding those two bump above the prices up ~$10 bucks, but you'll need 'em.
Both of those builds above are extremely solid! Good luck, and have fun =)
EDIT:
If you weren't yet convinced of the difference in GPU speed, here are some benchmarks of the 9600GT vs HD 4870:
http://www.tomshardware.com/charts/...compare,744.html?prod[2114]=on&prod[2067]=on]
My favorite bench? CoD4 (1680x1050, 4xAA, 8xAF, max. Quality):
HD 4870: 110.10 FPS
9600GT: 59.40 FPS