Schiit Vidars in Mono mode, but it will require balanced output. Plenty of current, plenty of power for a room that's an appropriate size for the 1.7s.
On the other hand, I've had folks recommend the Crown 300A with a recap job for the 1.5 and 1.6 Maggies.
My Vidars should be in service with my 1.6 QRs soon.