Never heard Mac gear with Vandersteen but, from the Mac gear that I have heard, they tend to make bright sounding speakers sound smoother. Vandy's are anything but, bright. I have TAD Amp and preamp with my 2 CE signatures but, have had good results also with McCormack and ARC gear. If you go with Mac, then try to audition first. I would be interested in your impressions..
Eagleman
Eagleman