Magnepan is a great speaker with amps of sufficient current. You may find that the amps which have the muscle, great current and enough WPC will ALLOW the speakers to sound their best. And why wouldn’t one want a speaker this good to sound the best? Also I think of inefficient speakers as not hard to drive.... rather they demand too much from amps which were not designed for them. It really is a matter of the speaker pulling too much from the amp.
As far as the 1.7, I would either go with a really good integrated like the Musical Fidelity M6500i or a pair of quality mono blocks like Parasound JC1.