I'm looking for a powerful speaker set with a subwoofer. I've heard good things about the JBL Creature II and the Harman Kardon Soundsticks 2, but they don't seem very powerful. I need something that puts out stereo-level sound and I don't want to spend more than $150. I have heard very good things about the Logitech Z-2300 and the Klipsch GMX A-2.1 Personal Audio System. Is either one better? Or does anyone have any other suggestions?