Dminches,
I have a McCormack DNA HT-5 powering the center (VCC-5), side surrounds (VSM Sig), and eventual rear surrounds (VSM -somethings, haven't decided yet.) I had a great experience with the DNA-500 in my old 2ch set-up so I thought why not give McCormack a try for surround duty. The front L and R are on their own monoblocks.
I woud like to also try a Parasound A 51 at some point, just for fun. I use a Parasound P 7 for HT volume control. If I won the lottery, I would buy a single Pass XA60.5 for the center and Pass XA30.5 for the right and left surrounds to match my front channel amps (Pass XA100.5) -- it's only money, right?.