Definitely use moly rings and make sure that your machine shop prepares the bores properly for these rings, like 320 grit hone. For hyper pistons, I would recommend ductile iron or steel top rings, instead of grey iron. Perfect Circle, Federal-Mogul, Childs & Albert, JE, etc. have these premium rings available. They will hold up better with the higher heat that is retained in the hyper piston crown. As BobC noted, make sure that you follow the piston manufacturer's gap recommendations to the letter.