Want a 7.1 Sound Card (USB?) for my iMac -- Recommendations?

[rmwebs]

I'm after a 7.1 surround sound card for my White c2d 24" iMac.

I've been putting up with a crappy Phillips Windows sound card which is very buggy, however really want to upgrade.

Can anyone recommend a card that can be used? Preferably fairly low priced and with line in.

Thanks guys!

 

[DoFoT9]

have no experience with any USB cards, but the FW cards are very fast and reliable id recommend something along the lines of them, very hard to find but.