I have been a fan of ARC gear since the late 1980s. I owned a VT100 mk3 for a few years and I was never truly happy with it. I now own a Ref 110 and it is a much better amp. There is just something right about the sound of the Ref 110. My ARC V70 had that same quality. I would imagine the difference between the VTM200 and Ref 210 would be similar.
My current system is a ClearAudio Inovation Wood with Universal arm - Ref 7 CD - DAC 8 - LS25 mk2 - Ref 110 - ML SL3s