if you're willing to spend the money, a new motherboard and processor would be a good choice but then you should seriously look into a new power supply as well.
I got a 6800XT, unlocked and overclocked to 6800GT specs and I must say...amazing. I run any hl2 mod at 1600x1200 highest settings (I don't touch AA/AF so whatever is default goes) with >40FPS at all times.
as you may also see, the rest of my rig is no Beastly McBeaster but it gets the job done
socket a has been dead for a while now, no processors made but you can pick up some on ebay for fairly cheap
amd athlon (barton core) is the best socket a got
abit does have barf orange pcb's!
asus also has baby-puke beige!
MSI has the blood red
DFI with the standard green
ECS loves purple
Epox loves green too
you could do window mods on side panel and top
also, you could run a 5v or 12v motor off your power supply and spin random things pretty much anywhere in/on your case
I got an infa-red usb thing to connect, works.
although it's really slow and often disconnects when transfering files. I mean this is really slow, probably no more than 15kb/sec
Hmm yeah I know this thing is usb 1.1, but if my motherboard was in 1.1+2.0 mode you think that it wouldn't cause any problems. I'll test setting 1.1 in bios
thanks, didn't even think about that one
EDIT-nope