Best cartridge for my analog system arround 500$ ?

A used Cartridge Man Music Maker III would be a fine choice--there's one on A-gon right now in that range. Apparently Len Gregory developed the cartridge on a Forsell airbearing arm, though I say that without knowing the respective arm weights of those two arms.

check this audiogon ad.

http://www.audiogon.com/cgi-bin/cls.pl?anlgcart&1247673389&/Zyx--R50-bloom-FACT-2-

a great deal

While I am sure many A'goners buy & sell cartridges in great condition and enjoy their purchases, please use caution when buying a used cartridge. Aside from stylus wear, the potential for cartridge damage due to accidents or poor handling are significant. I myself purchased a used stylus here, but I did so only after I was satisfied that the seller was reliable, and the stylus was in good shape.

You might even contact your arm's manufacturer for advice on a cartridge. They would likely know best what will work well in their arm.

The gain of the MM setting of the KPE is a bit low. It will be better match with MC or low output MM.

what music you like?That is my first question for cartridge choice....