Great Value in Used Phono Preamp’s?

Another vote for Graham Slee. I purchased an Era Gold Reflex with PSUI. Lucky find for $650. If you search for Slee used items and find one that includes the Slee power supply, then that's a big plus. It really brings out the best in the Slee units. Slee makes several models so if you go for that brand look into what features each have and what you need. If you use a MM or MC cartridge then that also fits into the equation. The Slee phono stages are excellent considering the price.

If you're just looking for a SUT, Parks Audio Budgie is a really good one for the money. They use CineMag and are impressive.  

I am definitely going to be on the lookout for one of those Graham Slee units!

The Dynavector is great
the MK4 displaced in my system by a Musical Surroundings Nove II
but just barely

had a rare single chassis Croft RS but I needed a SS unit that could be left on 24/7

yea

find a Croft if ya can.....

Here's a Croft phono preamp for stupid money - less than half price. 
https://www.audiogon.com/listings/lis90i94-croft-micro-25-preamp-tube