Help me chose a USB Sound "Card"

Can anyone recommend a USB Sound card that I can use for digital pass-through to connect by s/pdif or toslink to my Home Cinema Receiver?

I have no requirement to connect to speakers but it would be good if it would provide headphone output at the same time as the Dolby Digital.

Thanks

Dave

A google search using the terms USB Sound spdif throws up some suggestions...

Whats Google?

its a site which produces these things called BETAs.

Seriously though folks, I'm aware that most of these things have digital outputs of one sort or another. What I want is one that does digital passthrough. If you are telling me they all do then that's fair enough but I've had a devil of a job with some PCI cards getting them to do nothing at all with the digital stream and just present it at the s/pdif or toslink output!

Dave