Personally I would stay away from tube power amps. For reasons mentioned earlier. The pre amp you have is really good, can only dream of that kind of gear. If I were you I would buy some (maybe class A) SS mono amps. Place those amps close to your speakers and run long balanced interconnects and short speaker cables. Also I believe power amp will have less of an impact on the way your system sounds the the pre amp.
VTL MB450 monos Vs. BAT VK 60se monos?
I am currently using a solid state amp. I recently replaced a McIntosh SS pre-amp with the BAT VK51se pre-amp that I bought off AGON. WOW this move was a step in the right direction. Not a small step but a big one. So, I want to move to tubes for my amp too. These are the two set-ups that I am considering. Input would be greatly appreciated.