RBLNR:
My Clements RT-7s are about 20 years old. I had the crossovers completly rebuilt about 8 years ago with high-end parts from the Parts Connection... A great speaker got even better -- the imaging capabilities are amazing.
Phil Clements still makes speakers -- but, alas not longer the RT-7s, Ref-1s (big bookshelf ribbon speakers) or the Little Ds. If you call Phil you might be able to get him to make a pair for you... I'm not sure how he would respond.
Apparently, Phil also make a few sets of RT-9s (even bigger than the 7s). The 7s and 9s are floor-standing. The Ref-1s and Little Ds are bookshelf. A few times a year I see Clements RT-7s, Ref 1s, or Little Ds on Audiogon or Ebay -- they usually don't linger. The stock speaker is really good, but the rebuilt crossovers made it much better...
I talked to Phil a few years about about matching an amp to the speakers -- fast, clean power (but, not necessarily that much of it) is required -- with lots of bass control. Phil said the Futterman OTLs were about the best that he had every heard with the speaker... reliability was an issue, but the sound was great. Basically clean power, high current, and a VERY fast amp makes the Clements sing

. I have used Nad (good), Adcom (bad), Linn (bad), Belles (good), and Naim (good) power amps in my system with the Clements -- you can see my comment about the amp and speaker synergy.
I am searching for a Class-D amp match with the speakers -- the speed and 'tube-ish" quality of the Class-D amps (especially the Tripath chips) seem to approximate some of the OTL benefits without the issues of tubes and the HEAT of a class A amp.
I really like the speed and clarity of the RT-7s... IMHO, they has a lot in common with the high-end Apogees, but they aren't has hard to drive.
As you can tell, I'm very happy with my speakers

-- I have cycled through lots of electronics over the years, but since I got the Clements, they have probably been the strongest link in my system -- and, even after 20 years, that continues today.
PS: To others posting replys: Thanks for the tips about the Marsh and AVA and the affirmation about the Tempest. Phil -- you are correct, I want to try to avoid tubes...
Scott.