Video card recommendation?

[Trevor Barrie <tbarrie@cs.toronto.edu>]

Can anybody recomend a good video card to get with a new system? I'd
like something that'll give me good performance in XFree86... I'll also
have a Windows partition for games, so decent 3D performance under both
OpenGl and DirectX is also an issue. (OTOH, my taste in games runs more
towards adventures and strategy games than action games, so 3D performance 
doesn't have to be absolutely state of the art.)

Any suggestions? What cards have other people had good results with?