With a 30-30 you surely don't need to go crazy with a high-powered variable. Probably something like a 1x-6x would be plenty and I certainly wouldn't want anything above 3x-9x. Bushnell Elite 3200, or vortex, Burris fulfield , mueller, Redfield, all of them I have read lots of good things about and they range from about $130 to $200. Of course zeiss is good but they will cost three times as much as your rifle is worth