Is there a good external soundcard for my minimac. I recently bought the Logitech Z5500 speakers system for my windows box. I now rarely use that system. The Logitch speakers needs (3 plugs) in the soundcard for 5.1 listening. My Minimac only comes with (1) speaker jack. I know Creative Labs makes an external sound card, just not for OS X. Where can I find a good external soundcard for OS X?