Which Lamm should I add to the flock?

It is my understanding that your speaker is 89db effecient and rated at 4 ohms. I would say that the ML2 at 18 watts would probably not be enough. The ML1.1 at 90wpc would probably be pretty good as long as the impedence curve is rather flat. If the Tenors did well with you speakers I imagine the ML1's will also do well. The hybrids of course should have no problem with this speaker.

I would vote for the M1.2 Ref. I have been very happy. I wouldn't say they're HOT ... warm, but you can certainly always touch the fins on the side and the top. They do help keep my room warm during the winter, but do need A/C in the summer to keep the room bearable on the third floor of our house. Of course, the Tenors were my second choice, specifically the hybrids. But, unfortunately the company's financial situation scared me towards Lamm.

Best amp I ever heard was the hybrid 2.1. I heard a while back but I didn't get to hear the tube models. I agree with Kurt on that I just couldn't afford it.

I run my AA Capitole direct to Lamm M 1.2
The combination of tube and solid state is just fabulous
I asked Vladimir about changing to the ML tubes
I won't give his exact response but I still own the 1.2's
I've auditioned a lot of great amps None sound better to me than the Lamm M1.2

I second the 1.2 Refs - they are incredible and a noticeable improvement from my former 1.1s - which I owned for 5 years. They are more much more powerful than their conservative 110 watt rating. I also have the Tenor 300 watt hybrids and the Lamm 1.2s drive my speakers just as easily and with just as much authority.

Since the 1.2 Refs are virtually all Class A whereas the 2.1s are not, I think you will get a bit better sound from the 1.2s but if you need the extra power you don't give up too much with the 2.1s.

Good luck with your search - I don't know of too many Lamm owners who are unhappy. Not that reviews are the be all and end all, but have you EVER seen an even remotely negative review of a Lamm amp?