I received a BAT VK200 last weekend I bought here on Audiogon. In my short experience I definitely feel this is my favorite amp.
Right now, I happen to have a Pass Aleph 3, Blue Circle BC22, Bryston 4B and the VK200 and it's been fun comparing them. The Bryston has been used exclusively to drive my subwoofer, but I did compare it with the others in my 2-channel setup, and didn't care for it's performance. It sounded thin and bright, not my cup of tea. However, this is an older 4B and I understand the new SSTs perform much better with music.
The VK200 has a slightly sweet character in some ways similar to the Aleph 3, but with infinitely more power. You had mentioned you own BAT tube amps so you know about hot running amps. Well, this is no different, it actually runs a bit hotter than the little Aleph oven.
Although I use it to only run ProAc monitors, I think the VK200 is a good choice for HT because of it's super smooth character and power which seems like much more than 100wpc. Great bass too.