I need some sound advice

I've got the upgrade itch. Presently, I have a Music Hall MMF-9 that I really enjoy but want a bit more. I do like it because I don't like to fiddle with things. Would a change in cartridge be a good bet ( if so, any thoughts) or would i need to start over with a new rig? ARC SP-16 pre, ARC 150.2 amp, LM Labs 926 Electra speakers.

Thanks,

John