Cartridge Advice Sought

I re-entered the vinyl fold about 3 months ago and have been really enjoying it. Currently, my analog rig comprises a Pro-Ject RPM 5 table and 9c carbon fibre tonearm mounted with a Clearaudio Aurum Classics Wood MM cartridge, with signal being sent to a Channel Islands Audio VPP-1 phono stage and VAC-1 power supply. For the money, I think the Aurum is a fine entry-level product, but I've been thinking about the next step and the weak point in the set-up is probably the cartridge. Budget is $400 to $700.

Some of the carts that have caught my eye are: another Clearaudio in their MM range (Beta S, Virtuoso, Maestro), Benz Micro Ace, Denon 103R, Ortofon Rondo (Blue, Red, Bronze), Dynavector (20X, 19A, 17D2), Nagaoka MP-50. Any advice or suggestions would be most welcome. I listen mainly to various types of jazz, with some rock and classical thrown in for good measure.

Thanks.

Max