Worth upgrading? If so what to?

[spluff]

CPU - Quadcore 6600 G0 2.9MHZ
Graphic Card - Nvidia 8800GTX
Mobo - Gigabyte P3C-DS3R
PowerSupply - 500w Seasonic S12-500
Memory - 2x1GB Corsair Twinx XMS2 PC6400 |
Case - P182 case
Soundcard - X-fi Fatal1ty
Harddrive - WD7500AAKS (750gig)

Hi all,

Above is a list of my current computer and its been a while since Ive upgraded. I play a lot of games at 1680x1050 (monitor limit) but may get a larger one in the future.

A friend needs a PC so was thinking of maybe buying some new bits and building a new one and giving him the bits I dont use so he can build a new one.

Any ideas what to go for and how much?

 

[spluff]

i have it clocked at 2.9 from 2.4 and have an aftermarket cooler on..... it gets a bit unstable if i try overclocking much more.

So the new cpus and mobos dont offer much over what I have currently?

 

[spluff]

Noctua NH-U12F