Phono stage upgrade


It is the tine to upgrade my phono stage. For the first year of comeback in vinyl I used a heavy modded NAD 1130. For its price ($200) it is superb. Now, I would like to try something else.

My budget is $600 (including the power supply).

My cartridge is an Ortofon Super OM40 (MM).

What is in your opinion the best (used) phonostage under $600 for Moving magnet?

Thank you for your help.
rmihai
Second the vote for the Dynavector p75....I feel I would have to spend almost three times as much to get something materially better
Thank you all. I got a John Linsley Hood phono stage, built by Williams Hart. Linsley Hood dedicated his life to circuitry design (1969-2004), and his books are highly regarded by all important designers. A phono stage build by a guru in a vinyl lovers country? - WOW!!!

http://www.williamshart.com/1450revi.PDF

http://www.williamshart.com/1450rev.PDF

http://www.williamshart.com/1450reviewpt2.PDF
Although I got the Linsley Hood phonostage, I am thinking to try another one in the same time (for comparison).

It seems there are 3 contenders:
- Rogue Stealth
- EAR 834P
- Dynavector P-75

Now, is anyone that had the opportunity to listen all of them? If so, which was the favorite?

Thank you