Check out Van Alstine power amps. Mos-fet type amps would be a good match with the Vandersteens!
Owned the Vandersteen 1Ci and sampled several amp styles with them. I know that the 1 and the 2 series are different bass designs but my thoughts carry over in a positive way to a bass drive system like the 2 and 3 series from Vandersteen.
I spent more time listening with virtually no fatigue, unless it was a poorly recorded source, to the Wyred 4 Sound amp that I have. EJ has something surprisingly right in his designs that make his Class D use very easy to listen through. My listening notes have several references of similarity in sound signature and performance with the Krell KSA and MDA amps I owned before.
The mono or stereo amps from his top tier are worth at least some research. I too find their sound to be above their price point and similar to reference gear I owned before. The added bonus is the utility savings and lack of space heaters.