Semi,

This is my setup; Behringer PMX2000 Stereo powered mixer (500 Watts), 2 PC-15 Peavey 15" speakers with horns. This system is cheap, light, and powereful. It has plenty of bass, so much so that I can do a DJ gig without a sub-woofer. I use this as my keyboard setup as well as our rehearsal PA. I paid $259 for the PMX and another $260 for the speakers, all were B-stock items. I've had nothing but great success and reliability with this system. The speakers are plastic and weigh something in the 20-30 lb range.

You might want to check this out. I use this system in a 7 piece band!

Al