I am considering pre-owned 5-channel amps from all of the above brands. The intended speakers are Dynaudio 52's (L+R), 122C, and surrounds to be defined (must be in-ceiling). The pre/pro will likely be a Rotel 1066 or a B&K ref 30. Any comments on the above choices for amps? Any others to add? Would like to spend under $1000 on the amp (Rotel 1075, B&K AV 5000, etc.), so I will look to pre-owned.
The Rotel RMB1075 will drive those speakers well. The Arcam P7 will also drive them with no problems. The P7 is a much better amp.
For in-ceiling I recommend a pair of Speakercraft AIM3 speakers. The adjustable crossovers in the AIMs allows you to adjust them to the room's and speakers' presentation.