I would not recommend a high compliance cartridge like a grado. The shelter works ok even though it is high compliant. you did not mention how much gain your phono amp has. Is it MM only? Cartridges I like (Lyra Dorian)detailed but not too much, Benz ACE or Glider nice midrange, Sumiko blackbird also detailed. Depending on model you may not need a step up (my recommendation).
