CJ preamps?

Borowed a friends CJ PV4 an older tube pre. It really made my ATI amp and OHM Walshs sound great, much better than the SAE I was using. I am interested in which CJ pres to look at used say up to $1500? I see lots of different variations just on Agon now....PV 10, 10B 10AL and so on. Which models should I be looking for? I saw a reference on another site that said only look at 3. 6. 9,10? HELP.

Also, havent heard them but saw a pre from Canary Audio for $400....the CA200. Anyone familiar with these? I saw a great writeup for other more expensive units from them...they seem be a low profile sleeper.