Building a new computer! Need advice

[Aimforthehead]

Hey guys, I realized I had an extra 6870, and q6600 lying around. So I want to build a semi-good gaming computer.
Here is what I got so far.

1. TOWER - LOGISYS Computer CS305BK Black Steel ATX Mid Tower Enhanced SOHO Computer Case 480W Power Supply
2. PSU - Rosewill HIVE Series HIVE-650 650W
3. RAM - G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333
4. MOTHERBOARD - GIGABYTE GA-P45T-ES3G LGA 775 Intel P45 ATX Intel Motherboard
5. DVD DRIVE - ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner - Bulk - OEM

TOTAL: $236.21

Can anyone let me know if I am forgetting anything and that all of these are compatible with the 6870 and q6600? Thanks.
I already have a harddrive as well.

[Fubarable]

What is the graphics board? If it's a gaming computer, you'd best not skimp on this.

[Aimforthehead]

You mean the supported GPU?
The motherboard supports pci-e 2.0 X16. The 6870 is 2.1 however, they are backwards compatible with practically no loss of performance. I currently run a 6870 on a motherboard that is PCI-e X16 (From what I understand, 2 generations old in PCI-e years)