If you want to buy a solid graphics card that will last you a while, then go with the Gainward GeForce4 PowerPack ! Ultra/650XP Golden Sample G4TI4200 128MB VIVO DVI. It is very overclockable and the only major difference between the 4200 > 4600 is the clock speed of the GPU and memory... it costs about US$175+shipping.

Good luck finding one...

-CaP