Seeking Legit Cartridge Expert?

Anyone out there have a reputable guy who knows the nuances of carts in the $2000+ range? So many opinions.....

current set up 

VPI Super Prime Scot / 10.5 arm

Hana ML

Harbeth 40.3XD 

What's going to drastically improve my sound / detail....mostly listen to Hard Rock, Zeppelin etc....

Thanks!