VAC 70/70 OR BAT VK60 Mono's

I am looking for a mono configuration to drive my Verity Audio Parsifal Encores. I mostly listen to jazz and some classical. I listen late at night when everyone goes to sleep, so most of my listening is low level, and detail is very important. The rest of my system consists of a BAT VK50SE preamp and a Electrocompaniet cd player, Siltech interconnects, so it is a simple system. The room I listen in is 20x16, but will be moving into a dedicated room that will be smaller, about 16x13. Thanks for any and all imput.I would also be interested what anyone thinks about the VAC 30/30!