nV 7900GT / ATI X1900 and up :-D
If you're on a budget the nV 7600GT and X1800 are nice.
A single card offers much better price/performance than SLI or Crossfire so you are better off without it!
I would go for the X1950 because of the resolution he can play at.
Hey, linny, I haven't seen you in the while, what's up?