Don't use no bleedin' cornputer speakers!
For less money than you mention, you can buy a nice set of headphones which will sound WAY better than almost any computer speaker. OR is there something wrong with picking up a low cost, low power amp and real stereo speakers??? On my own computer, I can either plug in the Grado SR60's or plug in the patch cords to my main system (in the same room). Or you could do what I did for my ex-wife's computer, and it doesn't sound bad. I had a tiny MCS integrated amp lying around which sounds sweet if you hold back on the gain knob. We picked up a pair of Boston bookshelf speakers, hooked it all up, and never looked back.
Laz