As far as Class D goes, I have a Digital Audio Company 2-Cherry and it has definitely outperformed my expectations, especially when I put it behind a Tube Pre and a tube DAC. The DAC Integrated is not in the same league by the way IMO.
He has a 30 day return policy as well and no lengthy break in required. And the 100's of watts sound pretty impressive.
I've also had Pass before and Modwright but not with the Spatials and I almost pulled the trigger on one as well but I live in a hot area with no AC.
If you were nearby I'd offer you to try out the amp as I have a few others, but I'm West Coast.
Regardless, good luck ! And one thing I'd like to mention as well if you have never had High Efficiency speakers, is that , ime, every cable, Source, tube, etc has a massive effect on the end result and sometimes there is a magical synergy that happens with a certain combo for whatever reason. Again, I know you know what you're doing, but I know the Wilsons are a lower Sensitivity speaker.
Happy Thanksgiving by the way.