The 90 series are good indeed. Though I would not recommend the one you are currently using. There's a problem with video playback in it, at least in my card (7600GS). It may be card-specific though, since they are all different.
If you want to stick with the 90 series for a while, 93.71 is the way to go. Alternatively, 94.24. These 90 drivers are actually much faster than the 163.75 one. I would keep them, if it wasn't for a profile problem the 90 series have with my card (this is definitely card-specific).