Bit of an update. I decided to get the Pass XA-25 via Reno HiFi. Very happy with the price, condition, warranty, and service.
So far, I'm finding it a remarkable sounding amp. Never harsh, never lacking power, voices very intimate and present, soundstage complex and articulate. Lots of *depth* to the soundstage, too -- something the Van Alstine SET 120 piece lacked completely (a trial I posted about a while back). I know they're in different leagues, but it was something else to hear that difference.
Very happy with this amp. Don't feel I need more power. Drives my 87 db Salks just fine.
I regret not being able to try the other great amps mentioned here. Someday, who knows…