Just stay away from anything Creative, that's what I always say. They've been a bit sluggish about releasing driver updates. Remember what they did to the guy who made Vista drivers for their hardware?
I got M-Audio Studiophile AV 40, great monitors for the price. I have always been away from creative dont worry Its for girls, who just watches Johnny Depp films in Dolby. By the way, M-Audio or Terratec or smt. else? Will the Hi-Z input matter too much for my guitar?