Help me build an UT3 pc

I bought a PC for UT2004, and now it's... well, old and slow. That didn't really matter to me, since all I played was UT2004, but now there's UT3 and I need a new PC.
That being said, I still want to keep some parts, such as the monitor, the hard drive, psu and the dvd recorder. So, I need to buy a motherboard, cpu, graphics card and memory. My budget is not unlimited, but since I keep my monitor, I'll be playing at 1280x1024, so I'm guessing I don't need sli 8800gtx .
Now I ask for your advice. The graphics I belive it's easy to decide: 8800GT. Memory also easy: 2GB. (still, if you think I'll be better off with anything else, let me know). About the motherboard and cpu, I have no idea...

I don't need to think about future upgrades, I just need the pc for UT3 and nothing else (well, maybe empire earth 3, but I think UT3 is more demanding). When the new UT comes, I'll just buy a new pc.

Any help is appreciated.

thanks, I'll post there then.