You could try looking at the Altec-Lansing 621 2.1 speaker set. For about 1/2 the price of a comparable Klipsch 2.1 set (not much more than $75.00 USD), you get nearly as good bass response, an independent volume control, RCA plugs for easy setup and some of the loudest volumes available on a multimedia speaker setup.
The 621's feature a 200W MAX system output, with 143 W being the nominal output.
I'll give a thumbs up to this set of speakers, as I had them before my current Klipsch ProMedia 4.1's and they kicked ass. Great for tunes and bass of all kinds!
More information is available at
Altec-Lansing.com