I personally fancy the 9600 XT here.
+ Decent DirectX 9.0 support
+ On-chip thermal diode
+ Low power consumption
+ You can get one Zalman heatpipe equipped
+ Low price [eBay]
Runner up: Geforce4 Ti series
+ Excellent game titles legacy support
+ Very good DirectX 8.1 performance
Now I must also make it clear that I despise the whole FX line up. Geforce 6+ era cards are not legacy enough yet [:p]
XGI Volari Duo V8 Ultra
rage 128:D
I say Matrox G400 Max for its performances in office and graphics works.
Besides, that video card is AGP so you could install two Voodoo2 for GLide games too.
Bye bye
Ehm, favorite ?
Ati 9600 XT
Matrox G550
Volari V5 Ultra (a very noisy card !)
A legacy machine :
Matrox G200 + 2 Voodoo2 Creative Lab