Hi Mark,
When I had my ELS57's I first used the Leak Stereo 20, cannot remember what pre amp and my LP12, it was amazing.
I then progressed, or was it, to a Naim 12/160 that was more detailed but did not give the same feeling of something happening in front of you, as Jez says, done right they can sound stunning with valves.
I bought the latest Quad II Classics with the QC24 pre amp a couple of years ago in the hope I would get a pair of ELS63's, which I did get confirmed they were there and all reburbished, however although they were there for my taking I never went through with it so I never use my Quad valves much these days.
I would suggest for the feeling of something going on in front of you a valve set up, for accurate and dynamics go solid state, Naim 12/160 would be my choice or a 250 with the wick turned down.
All the best in your quest.
Cheers
John