Hey, thanks for the reply.
Yea the reason i am lookin at usb sound cards is that I have recently bought a macbook and would like to use it as a media centre in my living room with my projector and 5.1 surround setup.
The main input requirements are front rear and centre component outputs so that i can plug it to the multichannel inputs on the AV amp i have. I think the Audigy usb sound card has these outputs, so perhaps this is the one to go for?
Cheers
Robin