I had a chance to comapre Reimyo CAT777, AirTight ATC-2, Lebes rs100, diy 45 tube pre, CAT SL1 Legend, New Audio Frontiers Amati and finally I got Shindo Aurieges MM for my ATM211.
There are plenty of NOS VT4c GE, if you are patient you can find some RCA from WWII era.
In my opinion there is no point to look at current production.