Looking for recomendations

Hello fellow PC building maineiacs, I am looking to build a budget gaming computer. The graphic card is going to be offset right now because i sold my old comp for 300 bucks. $300 will be my graphic card budget aside from the bare system. For the bare system im looking at a total parts cost of around $600 or less without shipping and taxes. I want an AMD machine because it seems it's best suited for the purpose and price. I want the best comp for this amount of money please. Heres my build ....

$130 - ASUS M4A79XTD EVO AM3 AMD 790X ATX AMD Motherboard ====

$80 - Mushkin Enhanced Volta MKNPS600-A 600W ==== Product.aspx?Item=N82E16817812008]

$115 - G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 ====

$170 - AMD Phenom II X4 955 Black Edition ====

$50 - Western Digital Caviar Blue 320GB 7200 RPM 16MB Cache SATA 3.0Gb ==

$20 - Sony Optiarc Black ====


That equals 566 + $100 shipping and taxes = $665


Also, i am using the raid max smilodon mid tower case which will be hopefully housing an ati 5850... possibly a 5870. If anyone has the raidmax case and wants to inform me of any obsticles... please do. My monitors resolution will be 1900 * 1600.
I am hoping to overclock the CPU to 3.8 gHz.

Any suggestions, advice or information will be very appriciated.
Thank you