Martin Logan CLS "Buyer's Guide" Question


I’ve wanted a set of Logan CLS’s since I first heard them back in the 1980’s and would like to start looking for a pair, but could use some help to know for sure that I’d be buying a good set. Would you guys please opine on these concerns?

- What do I look for in a decent set to avoid a ’lemon’?
- What is the difference in characteristics between ’generations’ of CLS (I, Ia, II, IIa, IIz...)
- How can I identify which generation of CLS I’m dealing with, and how important is it?
- Would there be any concern about age of panels, or if the panels are replacements?
- Would you recommend a different model of ML speaker, and if so - which one, and why?

My current equipment is:
McIntosh C28 (presently in use)
Krell KRC-3 (inbound...)
Bryston 4BST
Dahlquist DQ10
Polk PSW650

I hope to replace the DQ10s in favor of the Logan’s, but it’s helpful to know what I’m getting into beforehand, to avoid a costly mistake.

Thanks in advance!

parabolic
Hey, guys. Just wanted to report in and say that I stumbled into a pair of mint condition ReQuests at a great price, so I couldn’t resist. They’re the newer design, production date in early 2000, and were in storage for some 5 or 6 years, so the panels are effectively about 10 years old.

If anyone has advice on tips, tricks, tweaks or general wisdom, I’m grateful for the input.
Mofi,

More props directed your way from this corner of the peanut gallery. Great to see this kind of contribution from fellow 'Goners.  It makes this a better place.
Excellent exchange.  Thank you mofimadness for sharing such good info.  I have a lead on a pair from a nearby estate sale...but now it appears they are original CLS panels.  You've helped me intelligently evaluate what I'm looking at.
Thank you!!
I would like to add to the kudos already given to Mofi for his advise.  I think he steered the OP in the right direction given the age of the speakers and other considerations.  Having said that, as someone who loves those speakers and who came very close to buying a pair of original CLS's when they were current I would like to add some thoughts to the mix of great info here.  

I listened to the original CLS's at length and several times at local dealers (Sound By Singer mostly) and one aquaintance before deciding to go in a different direction (Maggies).  For whatever it may be worth I remember clearly that the original CLS was generally considered by reviewers and at least a couple of CLS owners I knew to be "the one" with the magic and that the changes to the speaker up until the introduction of the 2Z to be improvements in amp friendliness and tonal friendliness by being less ruthlessly revealing, but also being somewhat of a step backwards in some ways.  The 2Z seemed to strike the best balance between all those considerations.  Fantastic speakers!
Someone needs to mention that those  dq-10s are not even close to any decent modern speaker.   Good move on the Requests.   Your logic is wrong on the years of not being used not counting.  If they sound good then thats great but realize they are gonna need new panels at some point.  Those are speakers worthy of new panels for sure.
Enjoy them