I have a rig w/ 2GB RAM DDR2, a wolfdate E8400 CPU, a GAEP35DS3L mobo and (until recently) an 8800GT GPU.
Unfortunately, the latter stopped working a few days ago... Now I'm looking to replace it for a GPU of similar strength. I don't have enough money to replace the whole rig, though I know it's quite dated now.
My gaming requirements are along the lines of MW2 or HoMM-VI. My budget is approx 50-100 USD.