I'm a big fan of high sensitivity speakers. I haven't liked horns and also have been unimpressed by the single/coaxial driver full range speakers out there.
High end audio stores lean strongly toward the low sensitivity speakers. I have my ideas why but that is another discussion.
First, you don't need to stick to 8 ohm speakers unless your amp has specific limitations (low current capabilities). Most sensitive speakers are 4 ohm. They do need to be well designed so that they don't' have low resistance dips. But the 3 speakers below are well designed.
I know of three good options:
1. Legacy audio Focus SE. A very nice full range speaker 95.5 db/m.
2. Aric audio is making a new full range high sensitivity speaker specifically for his line of SETs. I think these may turn out to be a good option but isn't available right now.
3. Tekton's line of full range speakers. the Ulf is 100db/m. Moabs and Encores at about 96 db/m. Great full range speakers with excellent midrange. They use 2 sets of midrange drivers with excellent results. They also have started offering upgraded crossover components as a result of enthusiasts doing their own upgrades. The downside is they don't' do fine woodwork so if paint isn't good enough for you, you're out of luck.
Jerry
