PS Audio BHK 300 mono VS Modwright KWA 150SE mono VS D'agostino Classic stereo

I'm familiar with D'Agostino Momentum stereo and it should drive  Thiel 3.7 based on specifications.

You should add Hegel H30 to your list.  I have one and is superb.  Again, base on spec it should the Thiel 3.7.   There are many professional reviews available online that describes the SQ accurately.

Thieliste, not sure you want to hear this, however, each time I pull up Thiel 3.7 or 7.2 on YouTube, nearly every video there was krell on these speaker’s, I mind you, they sounded damn good to me, I understand opinions are just that, an opinion

1990’s videos. It’s 2017!

I’m a Krell fan, owned 3 and last FPB600 ... great in its time Current SS is in a different world ... no comparison!

The best I heard 7.2 was at Stereo Shop on Mass Ave in Arlington, MA driven by a full stack of McIntosh.

If by any chance the Ypsilons can handle both of these speakers i would rather go the Ypsilon route.

I would definitely demo before purchase.