Dynaudio is a fine manufacturer - now that you've chosen your speakers, it's time to hear them with some different amps! I think they have a pretty consistent "house" sound, so hearing any Dynaudios with an amp should give you a good idea of the fit, 'tho best with floorstanders like yours, obviously.
Weren't you in the Chicago area? Dynaudio used to have an "Experience Center" in Northbrook. You should definitely see if it's still around, as well as any local stores that carry Dynaudio. You might want to look for an audio group, too. We have one in the SF Bay area, seems like a place as big as Chicago ought to.
I'm a definite Nelson Pass fan - a legendary designer, true searcher, nicest guy I've met in audio, and maybe the single most prominent figure in the DIY world (he's all over DIY Audio).
The only Class D I've checked out was a Hypex NCore. I preferred my 40+ year old Threshold, but made the switch because a) it was my office system, b) the eventual refresh I was facing would have cost plenty more than the new NCore, and c) Threshold resale value. I'm not ready to put class D in my main system, but you shouldn't necessarily rule it out. They're pretty cost effective and use a lot less juice to run. Of course, who knows if they'll last 40 years or not?
The other thing I learned from my experience (this only applies to NCore afaik, but is likely true for other class D) was that their amp RMS power ratings are only 1/5 of the quoted peak power! So, they have massive headroom but may not be able to sustain long periods of headbanging high power operation. For example, see page 5 of:
https://www.hypex.nl/media/c4/13/51/1738587870/NC500_OEM_02xx%20R11.pdf
Note 1: Typically, this is 1/5 of the peak output power. Apply sufficient cooling.