Creative AudigyZS has had excellent detection on on Suse10.1, FC5 (which Im using now) and Ubuntu for me. Dont have to do anything, it just works. It doesnt have SPDIF though, all the audigys are well supported to my knowlegde.
I guess it does have spdif support ( It has a digital 1/8 jack, I always saw spdif as rca connection) Probably get a adapter for your amp though. Good luck