I'm looking for an external sound card that connects to my computer via USB that works on OS X. The Creative X-Fi 5.1 seems to be a great choice, but OS X isn't supported (and I know a lot of people are having problems trying to get it to work on OS X). The only one I could find is the M-Audio Transit, but it's expensive and only has two outputs, optical and stereo 1/8". Any other suggestions?