Best budget Graphics card for mini tower form factor?

Hello everyone.

Can someone post a good GFX card for no mor ethne $100 for a miini tower PC such an emachine El series etc. So a low profile GFX card. My friend does some basic gaming WoW, Moonlight etc.

i know a regular card is too big. What is one of the best 100 dolalr or below gfx cards that are low profile and can fit into mini tower PCs? The slot can be the regular PCI 2.0

Thanks guys