im in the process of building a gaming computer but before i order anything i want to make sure everything will work together. here is what i have so far:
-->Phenom II X4 965 Black Edition CPU
-->ASUS M4A78T-E AM3 AMD 790GX HDMI ATX AMD Motherboard
-->G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBRL
-->GeForce GTX 460
-->SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
-->ENCORE ENLWI-G(2) IEEE 802.11b/g TPCI Standard Universal Add-in card Compliant with PCI 2.0 Wireless Adapter Up to 54Mbps Wireless Data Rates Supports wireless data encryption with 64/128-bit WEP standard for security, Supports WPA, WPA-PSK
-->ASUS Black 24X DVD+R 8X DVD+RW 12X DVD+R DL 24X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache SATA 24X DVD Burner - Bulk - OEM

I also need a sound card. if anyone has any suggestions for optimum sounds during games that will still work with everything then please list them.
If you know of any cool cases with about 500W of power that arent too expensive then it would be appreciated if you write some

thats a huge trek

You putting an NVidia card on a ATX Motherboard will limit your extreme gaming, benchmarking, and all that fun stuff. SLI NVidia on an ATX is usually a pain in the ass or not possible. Also the onboard sound on most motherboards is more than good enough to do just fine.

^agreed onboard sound will do fine as far as cases go theres the obvious, ebay or you could try overclockers or maplins, good stuff and reasonably priced.