Matt:
I'd say the All In Wonders are GREAT for HTPC users. While the recording software is a tad buggy, it gets the job done more often than not.
If I recall correctly, the All In Wonders feature a Dolby Digital out connector (RCA-style) on their breakout dongles. I'm not sure how well this works, though.
If you DO end up getting a sound card to go with it, be sure you get one with a digital out mechanism (either RCA or Optical) so you can transfer your sound to the receiver without a hitch. I'd almost say get a Creative soundcard, but mine has had so many problems I hesistate to recommend it. Supposedly many of the problems have been fixed on the Audigy 2 model, but I'm not so sure. Regardless, they are the largest sound card company out there, so there's somewhat of a lower likelihood you'll run into problems (though Creative is NOTORIOUSLY bad at issuing drivers).
Carl mentioned the All In Wonder 9000, which is actually replacing the 8500DV. I'm not sure how the performance compares, but if you'd like to save a few bucks, you might want to wait until the 9000s go on sale and the 8500s (ostensibly) go on clearance. Up to you, though.
