Try the last card standing in the AGP world.
The 6600 was no power saver but you'll still have to check your power supply and mechanical clearances.
I need a graphics card for my Dell Optiplex GX280. I don't know a lot about computers myself. I used to play starcraft 1 and it was fine but now starcraft 2 came out and I need a new graphics card to play it. I really only use my computer for business and light gaming. The starcraft 2 game box says the minimum video card is a 128 MB PCIe NVIDIA GeForce 6600 GT or ATI Radeon 9800 Pro. I also know that my computer has an AGP small form factor slot and 2 full size PCI slots. Now I don't really know what that means, but it may help. Can anyone point me to a budget friendly video card that would satisfy my needs?