The USB Matchbox II from Henry Engineering includes analog and digital inputs and outputs plus a digital AES/EBU output and front panel headphone jack. Avoid the problems that sound card interfaces usually encounter with this simple-to-use USB interface.
Totally pro grade interface. No goofy mic preamps for this box. This just line in with XLR ins and outs. clean and clear noise free digital audio. We will be getting several more.
I use a Neumann TLM-103 directly into a Mackie 1402 VLZ Pro, then to the Matchbox II to my Fujitsu solid state hard drive computer...and the Matchbox II perfectly translates the large dynamic range of the Neumann. I use NO voice processor because I want to deliver a pure audio waveform to my clients (Microsoft, Hewlett-Packard and others...) If the Matchbox II was a woman, I'd date it.