Cartridge for vpi Aries scout with jmw9 tonearm

Denon was very cheap, what's the budget for new/better cartridge ?
And what is the effective mass of your tonearm ? 

Definitely you have to look for cartridges with advanced stylus profile (shibata, line contact, micro ridge, stereohedron ... ), because your denon is conical.   

If the budget is under $800 then definitely look for MM or MI
If the budget is over $1k you could find LOMC (but you'be been using MC, maybe it's time for something else ?)  

The mass of that arm is 10 grams. Any Grado is a good match with that arm!
https://gradolabs.com/cartridges/

I ran an AT OC 9 on that arm and loved it!

I’ll second the Grado suggestion. I purchased an Aires 1 deck w/ JMW 10 in 1998 and used it as my primary and then secondary deck for several years. I already had a Grado The Reference cartridge and mounted it. Sounded great. I tested several other MM and MC cartridges over the years and always went back to the Grado. Detailed enough, warm and musical. My advice is to purchase the best Grado cartridge you can afford or fits your budget.

If you're looking for Grado try to find Joseph Grado Signature XTZ or another similar grado cartridge body and XTZ stylus (available separately). This is the best stylus for Grado. 

However, i must say there are better MM cartridges than Grado for sure.