best cartridge for MMF-7, stock tonearm,below1000

come on guys, any help? The cartridges I am looking at are the shelter 501, dynavector karat, Zyx r-100. which, if any will work best with my tonarm and table?

I'm not sure if the shelter would be a good match on the Pro-ject arm, not enough effective mass with a cartridge that has fairly low compliance. Not sure about the other two that you mention. Here's one suggestion, there is a guy over on the Asylum that is using a Benz Glider on his MMF 7 and seems happy with it. You do need to be careful with cartridge selection, think high compliance to be safe. I owned a MMF7 for a few years and while it is a great table for the money it may not be up to enabling every cartridge to do its best. I'd be afraid that you may be disappointed after spending alot of money, just a word of caution. I used a V15VxMR and was happy with it on that table.

I also would be cautious about spending more than $250 for a cartridge on a MMF7. I have never heard much praise for that arm or table.