The sound quality of the santa cruz is really good, plus it has the versajack on it, which is the most useful function on any soundcard I've ever seen. I've heard great things about the quality of the acoustic edge, and the quality is very close to the santa cruz, from what I've read. It may be ahead, but I'm basing that as a guess just based on price.
I am staying away from audigy, creative makes a lot of problems for people. Their driver support and updates are they worst, never seen any product as wide spread as Live which didn't receive updates for over a year.