I'm of the opinion that external USB soundcards are superior in every way to PCI cards.
Less/no electrical noise from components inside the machine, better compatibility, and you can run a long USB cable over to your HiFi/mixing desk instead of running long (potentially noisy) analogue cables.
I've had a lot of joy with a Terratec Aurion 5.1 USB. All the analogue and optical in/outs work straight out-the-box.
Dave
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