If you can stretch a little I suggest highly from personal experience (I owned two of these) the EAR 834P.
Phono stage rec for Rega P25 with ZYX R100-02H
Just picked up a used but perfect condition Rega P25 and added a ZYX R100-02H cartridge to it. My current phono stage is the Musical Fidelity V-LPS II, but I was thinking of upgrading with a budget of ideally less than $700-800. Any good matches for this turntable/cartridge combo?