Hi:
I know you said MM and MC cartridges, but I will convey the following: I use a Bryston BP-1 moving magnet phono stage in my second system, and it is actually darn good (it is not quite as good, but only not quite, as the phono stage in the CAT Mark III preamp I used to own, and sounds really great when used with expensive interconnects). I almost never see them used, but they are +/- $500 used, and are built like a tank. 20 year warranty, of course.
Good luck.