Conrad Johnson ET3, Mystere CA21 or Prima Luna Pre

I can't compare the 3, but I have owned an ET3SE and I liked it very much. It's got in my estimation, detail without harshness along with warmth.

Definitely worth a listen to see if it's to you own liking.

The Mystere and Prima Luna Dialogue line are 'essentially' the same. The PL prologue series is a step down for sure.

I've heard both the Mystere and Prima Luna products - very nice I must say, although probably 'average' at their price point.

I have not heard the CJ you mention. Guess it depends on what you are mating it with and your choice of tubes.

I would look for a used Aesthetix Calypso, which usually goes for a little over $2K. I have enjoyed mine immensely...it has a big, addictive, enveloping sound associated with tubes but also has great frequency extension. Very reliable and quiet to boot. When they are listed on Audiogon, they sell fast, which says a lot about the preamp. I wouldn't buy a Prima Luna or Mystere new, as you are likely to take a hit on resale once the upgrade bug strikes, especially since neither has a reputation as a giant killer. Another choice would be Manley, which also makes very reliable and quiet gear, although I prefer the Calypso to the Manley Shrimp (a preamp that also would be in your price range new.). Manley throws a wider soundstage than the Aesthetix, but the Aesthetix is better in all other respects in my experience.

I recently bought the Mystere CA21 and must say this is one beautiful preamp! Wonderfully musical and resolving, this has elevated my enjoyment of my system considerably. Highly recommended.