I found a local dealer for the USAmps TU (tube hybrid) series. As much as I love the Butlers, I would save over $300 to jump to the USAmps 4 channel amp. Does anyone here use them? Are the Butlers really a $300-350 better amp? I don't know much about USAmps other than that they are Made in California and a Tube Hybrid (which is the type of amp I want).