I hope not to ruffle too many feathers
but I find Aqua C's to be sub-par performers. They can skim and I appreciate the ingenuity of their spray injector however, downdrafts, Beckets, and NW's are more effective by design. As a plus to AquaC they are well made and I have had good luck with their customer support.
Of the three skimmers you have mentioned the RS-80 would be my pick. It should handle a well stocked 65 and be plug and play.