Umm, the 507 is a Receiver, and a good one at that.
As far as Processors, I auditioned many specifically for 2 channel. I preferred the Bryston SP1.7 over most by a wide margin. But I didnt hear them all and budgeting limitations kept me from a few.
The Classe SSP-75, Sunfire TG3, and the Krell HTS7.1, were some of my favorites as well. Considering, I was buying new, my budget was around 3.5k, I didnt need/want video switching, and true ananlog bypass was a must, the Bryston was my choice.
EAD and Anthem have a strong following as well.