Trying to figure what you really want. You going from a Jem jr. to a Jem 7VP price range with the RG5120M. If you want a Jem I'd suggest getting a Jem, but if you're fine with an Ibanez then then you'll get more bang for the buck if you buy new. If you buy used the Jem prices are much closer. My suggestion would be to play a usedJem or Ibanez and then decide
I have a fluence modern on my Schecter, and they'll be no problem playing metal on those pickups.