I have a pair of HPM 100's that I am currently driving with a 50wpc Onkyo receiver in a bedroom system. I was originally using an SX780 and they seemed to match up very well. I decided I wanted a receiver with remote control and timer, so I got the Onkyo. The Onkyo does a credible job, but admittedly I don't drive it really hard very often. I think you would be satisfied with either, as far as sound quality is concerned. In a blind test, I don't think I could tell which receiver was driving them. HPM's are fairly efficient, so any decent amp/receiver in the 50wpc range should be fine.(JMO)
Oop's, just noticed that this thread is a couple months old, sorry I'm late to the game!!!