McCormack Amps are a good match.
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I have those speakers and have used Bryston 3B-ST and Quicksilver V4 Tube Mono Blocks. I have recently settled on Red Dragon M-500 Class D Mono Block amps. The others were good in their own ways but overall I prefer the Red Dragons. Clean, powerful, great extension in treble and bass. Very reasonably priced.
Another option is finding a used Audio Research 100.2 or 150.2 which also were quite nice. Good luck.
The NAD M3 would be punchy, substantial, and powerful with a large and deep soundstage. Smooth. Probably not the last word in air and high frequency detail but that could be a good thing if you have a reflective listening space. It also has tone controls and I did not find their effects objectionable but unnecessary. Around $1400.00 or less used. I would've kept mine but I like to have a larger display so I can see the volume before I start a song.
I used to have the Vandersteen 3A's. I used 4 monoblocks to drive them. Two per speaker, one for lows one for highs. The ones I used were the SM-70. It was most amazing sound to me.
You should be able to get 4 of them for $3K. They sell direct: www.monarchyaudio.com. Email them and they will offer you lower than list price.