Hi enofile,
IMO you have numerous good options to consider. Have you decided on a budget range? There are excellent amplifiers of various topologies that I believe would serve you well. I have a bias toward low to moderate power simple circuit amplifiers. These types of amplifiers consistently sound very good.
I'm particularly fond of SET but good quality push pull tube amps (class A or class AB) can sound superb. Also OTL tube amps and pure class A solid state (for example First Watt, there are others as well). You truly do have many fine choices. Budget, room size, listening levels (SPL) are factors that will influence you direction.
A well designed amplifier with high quality power supply and transformers with power in the 10 to 50 watt range should work very well with your higher impedance/efficient speakers.
charles