Gryphon vs. D'Agostino
I love both to drive the very hard loads of most Wilsons, especially the Alexia .9ohm (epdr) in the lower bass.
My money (if I had it) would be on the Gryphon Antillion Evo or better. As these do the doubling of wattage thing (an indication of current ability) better.
And these also have user adjustable Class-A bias on the fly up to 100w class-A
Cheers George