Logitech X1 - The granddaddy of all your Z560's. They sound great for their $5 after MIR cost They are only 25W RMS though.
I always buy cheap speakers and run them into the ground. Previously I owned a pair of Philips speakers that broke after about a week of use. Good thing they only cost $5 after MIR. And before that I had an awesome set of Altec Lansing ACS 66i speakers that were refurbs and I got them for about $20 through the Hot Deals forum. Their satellites each had 6.5W RMS and the sub had 27W RMS!!! Unfortunately there was a problem where the power cord from the satellites entered the sub. The connection was bad and eventually I couldn't get the plug to make contact.
Edit: Mine are Logitech X1's, not Z1's