Cartridge upgrade?

I've got an old Stanton Gyropoise turntable with a mid-fi system (Dynaudio Countour 1.3 MkII speakers, NAD 320EEE integrated amp). I'm sure it's time to change my stylus. Is there a possible cartridge upgrade that would make me sit up and take notice? I wouldn't mind spending 2 or 3 hundred bucks...