Phono cartridge advice: replacing an Ortofon MC Rondo Red

Hi all - 

Looking for advice on a cartridge replacement/possible upgrade.  I say 'possible' because the Rondo Red sounds pretty damn good to me, but have nothing to compare it to.  I also don't know how 'polite' it is, but have read such in reviews.  I like the idea of neutrality but wonder if this cartridge is overly analytical.  A local sales guy told me that he 'always' recommends Dynavector for rock/jazz fans.  Claims the 10 x 5 is amazing and the 20x2 is all that and more.  I've also read great things about the Ortofon 2m black.  My system is simple:

Rogue Pharaoh integrated amp
Ryan 620 speakers
VPI Traveler, currently using an Ortofon MC Rondo Red

I listen to classic jazz, rock, some metal, and ambient electronic. 

I'm considering the following, but have no way of sampling of course.  None of the local shops have demo tables with any of these on them.  My budget is $500 - $800, but could stretch to $1K with a compelling enough perspective.  

I'm considering the following:
Dynavector 10 x 5 or 20x2 (would be a stretch)
Ortofon 2m bronze or black (but only the bronze if it was a lateral from the MC Rondo Red

Hope that makes sense - any feedback is appreciated!  Thanks - !