A buddy of mine wants to know which amp is better. He has a set of Boston's to drive. Build quality, price, transformer, durability etc.  The Adcom cost $600 more however.   Thanks

Sorry if I'm beating a dead horse here, but can I go wrong with any one of these? Would any of you pick one over the others?

 Updated (index added, original post follows): Project: DIY HT, approx 15'x26'x10' in basement dug under existing house, IB sub, absorption/diffusion acoustic design, motorized hidden entrance, star ceiling, room within room construction, CIH curved screen, three rows. Current Status...