My cleaning lady ripped the stylus off my Grado (low end wooden body) cartridge the other day and I'm looking for something new. My system is a VPI HW-19 MK-III to a Mcintosh integrated that goes to a pair of BWs. My budget is between $300-700.
I bought the turntable with the cartridge already installed so I'm pretty inexperienced when it comes to analog...
I had really good sound with an AT-OC9ML on a -19 III with a Premier FT-3 arm. Other possible options for the RB-300 might include a Denon 103R and an AT-33EV. All of these options would also require a step-up transformer, but that would fit in your budget.
Ortofon 2M Blue ($230) or Black ($550). they are very easy to install due to predrilled/threaded holes and the body is shaped for easy fit on nearly all arms. And the most important-very musical cartridges.
If youre looking for MC, I think the Zu mod of Denon 10R looks very interesting.