2 top lists that could be interesting :
1/ Favo-% top list could represent cache owners with good quality, ranked by :
(number of favorites you received / number of premium logs on your caches)
I think this value is already computed on profil stats, tab "Hides", line "total nb of favorites received" ?
2/ Favo-Karma top list could have also some interest, quite similar to the Karma top list but based on the favorite points rather than the logs :
(number of favorites you received / number of your finds) - maybe mutiplied by 10, as we gain 1 favorite for 10 logs
The both top lists may need a minimum of x favorites received.