I am a fan of low-powered amps, particularly tube amps. I own three of that variety, the "biggest" weighing in a 6.5 watts per channel. I've played my system with various solid state amps, and the one I liked the most was the First Watt J-2.
It is good to see more efficient and easy to drive speakers coming on the market. I do like a number of systems using full/wide range drivers, particularly when those drivers are actually used in multi-way systems. For pure single driver systems, I like the speakers made by Charney, particularly when AER drivers are used. The Cube Audio Nenuphar also delivers the goods one expects from single driver systems--clarity, vivid and exciting sound--but it has more of the roughness and peaky quality than the Charney. I also like the single driver systems by Voxativ which also deliver the goods without an excess of bads. In multi-way systems with fullrange drivers, I like the canoe-shaped speaker from SoundKaos. I've heard quite a few custom-made systems using such drivers built by Deja Vu Audio in Virginia--my favorite utilizes an old Jensen M-10 13" field coil driver run fullrange, with a simple highpass filter to a tweeter; another uses a new G.I.P 4165 reproduction 12" field-coil to a tweeter.