Amplifier for Jordan JX92S Transmission Lines

I'm building a pair of transmission line Jordan JX92S speakers, and would like some advice on a complementary amplifier. They are not super efficient but not bad either (mid to high 80's)... a lot of people have used gainclone amplifiers with them in the past. (Is that the same as a Class D amplifier? If so, they have continued to progress).

I'd either like an integrated amp or I can hide the amplifier under my bed (it's for a bedroom system) and just have a small preamp showing. I was thinking maybe Naim, Portal Panache (I like this option because of good headphone circuit). Any other ideas?

Thanks, Peter