Very interesting discussion here.
In seeking alternatives, we need to know what the problem is with the current set-up.
I suspect it must have something to do with sound. Alan, what do you notice that you do not like?
I am an M50 freak here using all different kind of variants. ALU capsule, mylar capsule, original tube version, Decca transistorized version etc.
FLEA makes a very good M50 copy---sorry to say that it is indeed also offering authentic "cosmetics." Their version is with a gold mylar capsule.
I would need confirmation direct from the source to buy the news that Wunder is using an ALU capsule since they are getting their mics from FLEA (with Thiersch's capsule membranes)
What would you like to change about the sound of your current set-up?
Alan---I really enjoyed your score recording of "Vantage Point." Very nice work!