Win 7, try it you'll like it! In my latest system, I haven't had any trouble getting Win 7 drivers. All new hardware though.
Now my friends old machine running vista...32mb graphics card from 2001 - no Vista drivers, 16mb graphics card from 2000 no Vista drivers. I think he is going to downgrade to XP because of the lack of drivers for his older hardware. Of course, anyone here would just update they hardware, but most of us are computer geeks - different from a lot of conventional computer users!