Levinson 26S question

I am looking for a Levinson 26S preamp to go with my 23.5 amp and 25S phono preamp. I understand there are two or three models of the 26S. I'd be grateful if someone could explain the difference between the models and advise which would be the correct one for streaming, open reel tapes, and vinyl given my existing Levinson components? Also, I've noticed several ebay listings for a Levinson 26L or 26SL (sellers usually in Japan). Are these versions of the 26 or the 26S?

I also have a related question - how would a pair of ML-2s compare to the 23.5? Would the ML-2s pair well with the 26S or would an earlier Levinson preamp be a better match?

many thanks!