Go to Radioshack and buy one of those RCA mini-speakers (LS-10). They are a two-way design, 50w RMS, 100w max, with 4inch woofer and dome tweeters.
They now sell for $24 each. They sound really good and the cross-over actually has glass filaments on it to protect from speaker blow-out.I was looking at the drivers and compared them to the drivers used in the Klipsch satellites and they look similar.
They are also magnetically shielded and small enough to fit anywhere in your desktop.