Hypex perhaps, has modules and also ready built amps + one pre (minipre).
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You might be sorely dissapointed by using a revealing SS amp like a Parasound with a PC soundcard. The crappy op amps and electrolytic coupling caps used by these cards will limit sound quality and a high resolution power amp will just emphasize distortion.
I would upgrade the soundcard if you can with better op amps first, and better coupling/bypass caps. I think there are a few tutorials for doing this on some soundcards.
Parasound HCA 1000-1500 power amps are good deals used. But they are not small and won't easily fit on a desk. They sound pretty darn good for the cash.
That was what I expected, but the Asus Xonar Essence soundcard is especially designed to defeat the typical soundcard nasties, was well reviewed and actually rated listing in Sterophile's Recommended Components. Nonetheless, My fall back is the coax S/PDIF output and some nice outboard D/A converter. http://www.highrestech.com/ has some interesting items designed by Kevin Halverson. But first the amp.
Well, if you use your coax out and a Bryston BDA-1, that's a different story.
There still may be an issue with digital out from sound cards. Look to that site computer Audiophile.com. There is a lot of discussion there about the sonic issues of using consumer soundcards (no matter what claims the manufacturers make for them). Bryston and others building dedicated audio servers use special sound cards that avoid some of the digital pitfalls found in commercial cards like the ASUS.