Upgrade help please

[Tangerine]

Please help me as i am at a loss as to which components to buy.
I am upgrading my aging 3 year old 4000xp system and i have roughly £660 to spend and so i will need :-

PSU
Motherboard
CPU (Q6600 looks nice)
Memory (4gb)
2 x Video Cards

I am leaning towards getting 2 x Nvidia 260 cards but then i dont have a clue as to which motherboard i need. Would i be better going with ati and crossfire or is SLI the way to go? I am a mad gamer hence video power is a must.

This upgrade has to do me for the next 2-3 years so it needs to be good and fast if possible.

Any suggestions would be greatly appreciated.

 

[Tangerine]

thanks for the replys.

I also do some video converting on the pc but thats about it.

I came up with this spec using the 260's which i could just manage.

Your opinions would be great.

Corsair TX 750W ATX2.2 SLI Compliant PSU (£76.36)
Intel Core 2 Quad Pro Q6600 "Energy Efficient SLACR 95W Edition" 2.40GHz (1066FSB) - Retail (£117.49)
Gainward GeForce GTX 260 896MB GDDR3 TV-Out/Dual DVI (PCI-Express) - Retail x 2 (£328.98)
MSI P7N SLI Platinum nForce 750i (Socket 775) PCI-Express DDR2 Motherboard (£91.64)
OCZ 4GB (2x2GB) PC2-8500C5 1066MHz Dual Channel Platinum Series DDR2 (OCZ2P10664GK) (£64.61)

Comes in at £679.08 but i have no ideas about the mobo quality etc.

I dont need to overclock yet so running the cpu's with stock fans will be fine. I do have good cooling for the case.

 

[Tangerine]

ok i guess my spec is carp then.

Ben with your spec do i need the cooler or can i run the cpu with the retail fan?

And do i need the modular PSU or can i get away with the standard version?