I think this little job would be just what you need, small, quality, plug and play with computer and 22's:
Computer DAC/Amp Or, look around the used sites or bargain places. I paid $150 for my Onkyo system on clearance from Crutchfield. You don't need much and I bet with some patience you could get a system to bypass your sound card and add 10-40 clean watts to your M22 for under $150, and have a great little setup.
(Note: I use mine 8 - 15 hours a day, so I'm a little particle to decent sound as I work.)
