First Time Builder Please Help Me with System Spec!

[HHS1990]

Hi everyone, im new to this forum and system building in general, but basically i have been researching for a few months now and am almost ready to place an order with OCUK. I would really appreciate some opinion on the system i.e. compatability, reliability, and overclocking potential. I currently already have a 'Gainward 8800GTS 640MB' so the graphics card is done for the time being, here is the rest of the system

Microsoft Windows Vista Home Premium 64-Bit Edition DVD - OEM

Intel Core 2 Quad Pro Q6600 "Energy Efficient SLACR 95W Edition" 2.40GHz (1066FSB)

GeIL 4GB (4x1GB) PC2-6400C4 800MHz Ultra Low Latency DDR2 Dual Channel Kit (GX22GB6400UDC)


Asus P5KC Combo Intel P35 (Socket 775) PCI-Express DDR2 & DDR3 Motherboard

Samsung SpinPoint T 500GB SATA-II 16MB Cache - OEM (HD501LJ)


Samsung SH-S202JBEBN 20x DVD±RW x12 Ram Dual Layer DVD-Writer (Black) - OEM

Arctic Silver 5 Thermal Compound (3.5g)

Arctic Cooling Freezer 7 Pro CPU Cooler (Socket LGA775)

Creative Sound Blaster X-Fi Xtreme Gamer 7.1 Sound Card - Retail

Antec P182 Super Midi Tower Case - No PSU (Gun Metal Black)

Antec Quattro 850W PSU

Total : £819.94

I do a lot of gaming and want to have a future proof system that will last a couple of years. Will it be worth having 4GB of RAM?
I hope this is enough info and would really appreciate some advice!

 

[HHS1990]

Wow quick replies my max budget is about £800 (excluding graphics card), and i have a 22" Asus monitor.... Yeah i was thinking that the psu was a bit overkill, but i might possibly go SLI or crossfire in the future.... But the geil ram is good..? My alternative was the corsair 2gb XMS PC-6400 but slightly more expensive...

 

[HHS1990]

Great, thanks for all your help! ill probs go for the Corsair 620 PSU... save a few quid! is the tuniq towwe 120 a more efficient cooler than the freezer pro 7?