What are some of the most efficient and well built amp companies out there? I just bought a pair of dynaudio 242's and I'm looking for an amp to run them. No budget just want a amp that is well built and effiecient. Now correct me if I'm wrong but after reading many threads there is no diffrence in SQ between a 5000 dollar amp and a 500 dollar amp that are both equal in power. Except for the efficiency and the quality in which thier built.