BAT vs. Quicksilver

I am contemplating selling my VK-60 for a different tube amp. The Quicksilver V4 mono's grabbed my eye, I like the 120 watt power rating & really want to run mono's. How do they compare to the BAT? I originally planned on buying another VK-60 & running a pair mono but don't know if I can really afford too. Also does the BAT need to be sent in for the mono conversion?

My system consists of VR4 jr's, MIT & DC Labs cables, Parasound transport & Benchmark DAC for a passive pre-amp. I listen to rock music only. I love the Bat but need MUCH more power.