Pure Gold makes an excellent choke. I do not shoot with a Kicks choke because they are not rated for heavier than lead loads.
Nitros would give you killer patterns, but the Winchester Xtended Range should do pretty well for you too. I have found the Hevi 3.5 #6's, and the Winchesters Xtended Ranges to be fairly forgiving as far as patterning with different sized chokes. While the Hevi 3" #6's does not prefer to be overchoked.