I would go with a replacement stylus (approx. $60) for your FC+ or try the latest version (V3?) of the Grado Prestige Gold or Silver for well under $300.
I like the less expensive Grado cartridges in my system.
Yes, you need a higher output cartridge (greater than or equal to the 2.5mV spec I posted).
The new Grado will have more detail than your old model, but will still sound similar.
DeKay