Be carful with Llano Designs as noise and warranty may be concerns. as for the Bel, Aragon, and Bat amps they are all good values. If you want to be happy long term I believe the Sierra Audio Denali is the new king of the amps. retail is $7500. but I have seen one or two used for around $4500. It's big and it runs hot but nothing is built like it or sounds like it. Smooth sweet Mos-fet sound with resolution to dye for. highly reccomended. see "bound for sound" review.