SB Audigy Platinum or Platinum EX would be my choice for sound. They come with the audigy drive which allows front panel connections of all types for your PC's audio (inluding optical).

As for video, I happen to be partial to ATI, but I'm sure someone else will have an alternative suggestion that's just as good. I have seen a 64MB 8500DV in action, and they are just amazing. When I start upgrading, I'll be looking for the 128MB version.

Edit: On ATI cards, it's important that you don't bother with the LE versions. Those have slower speed GPU's, and aren't worth the money IMO.