My system, could use some advice

Hey whats up guys, I built a system back in september. I'm fairly familiar with putting computer's together and the basics. However, I'm not very familiar with overclocking or optimizing the hardware to run better, but I can learn. Heres the setup, I'm hoping you guys could give me some advice as to what I should look into doing, i feel like this system has alot more potential.

Coolermaster Centurion 5 Case
EVGA 122-CK-NF68-A1 680i SLI mobo
Intel Core 2 duo Conroe 2.66ghz
Arctic cooling Freezer 7 Pro 92mm CPu cooler
Crucial Ballistix 2x1GB DDR2 PC2 8500(Bios says its running at 800mhz)
Seagate Barracude 7200.10 500GB 7200RPm SATA 3.0Gb/s
Evga 8800GTS 320mb
Samsung 20x DVD Burner SATA
Samsung 940BX 19" LCD monitor
Rosewill 550W SLI Ready PSU
Logitech G11 Keyboard
Logitech X-230 2.1 speaker system
Microsoft optical mouse thing

I think my ram and hard drive choice wasn't the best choice. I have 18 days left on my step up program, I think i'm going to upgrade the 3d card.

Crysis doesn't run as well as I wish it did, even Call of duty 4 struggles on some maps. I mainly would like to make it optimized for gaming. It scored 9352 on 3dmark06, I think thats a little low for what it can do? Thanks ahead for everyones advice.