I've had BAT stuff for years now. Several Amps...VK200, vk 60, now a VK75SE. One preamp, VK50SE that's now a 51se, and 2 phono stages...now a P10SE. No problems, great service. Very highly recommended.
Sounds like you want a good 5 channel amp? The VK6200 is one of the best. What I can't help you with is matching with your MacIntosh gear. Seriously, call BAT and ask them.
I've heard and read, that the Autoformers really make some of the Mac amps awesome.
Good luck to you.