UNDER $500 gaming computer box

[Traak]

I wanted to help our peeps be able to get a vision for some gameability on a low budget.

$499.91

Basic case
250GB drive
Nice AMD motherboard
Radeon 6850
SATA DVD reader
Rosewill 500W power supply
Decent 2X4GB of RAM
AMD Phenom II CPU, Quad-core
100mm CPU cooler/fan

Starting with our basic cheap black box to keep the components from having to sit on the floor
GIGABYTE GZ-KF03B Black SGCC ATX Mid Tower Computer Case
$19.99

Nice, 250GB HDD
Seagate Barracuda ST3250312AS 250GB 7200 RPM 8MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive
$36.99

Motherboard with future upgradeability, RAID, Crossfire, overclockability (at least for the RAM)
MSI 870A-G54 AM3 AMD 870 SATA 6Gb/s USB 3.0 ATX AMD Motherboard
$94.99

Video card
HIS H685FN1GD Radeon HD 6850 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity
$134.99 with mail-in $10 rebate
Inexpensive thing to load Windows
LITE-ON Black 18X DVD-ROM 48X CD-ROM SATA DVD-ROM Drive Model iHDS118-04 - OEM

Crossfireable power supply
Rosewill RV2-500 500 W ATX12V v2.2 / EPS12V SLI Ready Power Supply

2X4GB of RAM, 1333MHz
Team Elite 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Desktop Memory Model TED38192M1333HC9DC

Phenom II AMD
AMD Phenom II X4 830 Deneb 2.8GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 95W Quad-Core Desktop Processor HDX830WFK4DGM - OEM

CPU cooler
EVERCOOL HPFA-10025 100mm Ever Lubricate CPU Cooler (Buffalo for AMD)

I wonder what you could change to increase your FPS. Cheaper CPU and RAM, more VPU? PS is kind of unique in that it gobbles heaps of net code and thus uses the CPU a lot more to place all the people, vehicles, explosions, bullets, and whatever on the map relative to you.

Recommendations, while keeping it under $500?