clearaudio champion w/ unify but what cartridge?

i'm getting ready to set-up my new clearaudio champion with the carbon fiber unify tone arm and i'm looking to get some cartridge recommendations. I'm moving up from a MMF 2.2 with a blue point no. 2 and in fantasy land i'd like to end up with a stradivari. but to start what would some good matches between 300 and 1000USD? Or if anyone has a used symphony you'd like to sell me?