Which Lamm should I add to the flock?

Shure I will.

I found the best 6922s for Lamm Hybrids are the Amperex Pinched Waist 6922 and Seimens CCa. For some reason, I was not impressed with the Telefunken CCa. Power cords also make a significant improvement.

I've seemed to stay on the tube side of things and you haven't heard the ML2 until you actually do hear them with your own ears. When you do, you will be in for a shock to hear how un-hifi it is, with transparency beyond what I imagined from all the rave reviews. Timing becomes the very essence of the overall musical structure, add that with an ease of delivery and speed.

For me it all started with a preamp first, and then the rest of my system was broken or sounded wrong. Start small if you're not sure at first, get a preamp and experience a taste of what's possible. It's not for everyone (trying to be biased here) but if you like it, it will change the way to listen to music.

My system can play plenty loud, but I enjoy listening at very low levels, because nothing is missing, and it's simply there, why listen loudly?

With all that said, I have not heard the hybrid brotheren.

If you are looking for a really clean tube that is a drop in for a 6922 that won't cost you $200 try the under recognized but really better sounding Mullard CV2493 not the 70s 6922 or even the CV 2492. I think I got mine from Tubemonger I'm not sure though. It is in a class of its own and really has a superbly clean but great tone simply a different sound than any other 6922 variants. I tried a boatload except for the ridiculously expensive collector's trophies. Contact me offline and I'll give the run down. (I don't understand the use of a 12AX7 in a circuit that is made for a 6 volt tube not a 12volt, be careful or you will destroy your cicuitry.)

I, too, chose the Lamm M1.2s to mate with my Wilson Sashas. It can't get any better than that.