Parts Express is a fantastic company to deal with (and no, I'm not a paid shill). I've never had anything but good luck with their products, and the Dayton APA150 is a STEAL, for as many dollars as watts when both channels are working into 4 ohms. Its ability to do stereo lowpass is also incredible - it would be great for driving helper woofers in a low-power rig. Just remember, if it looks cheap, and is cheap, it probably sounds cheap, but the user reviews help you avoid any outright duds among their product range. If you're a speaker DIYer, you've got to make the pilgrimage in early march for their Tent Sale and DIY event, even though it is a little hyped. If you're a beginning designer looking for good opinions, there's no better 'first' show to start bringing your products to.