I second the Klipsch ProMedia 2.1's, if you want real bass, and have room for the subwoofer. Check the reviews on Amazon. I bought them after a lot of research, and they're great speakers (better than the huge, expensive ones on my stereo system).
Refurb unit is avail from Klipsch for $90; haven't checked ebay.
Only downside I know of is that the power switch is on the back of the sub, and they consume power even when not in use. Put the speaker system on a power strip, and shut it off when not in use.