I'm not sure where you're located, but if you decide to put down a epoxy floor, make sure you put styrofoam sheets down on top of the garage fill and then heavy mill plastic over that. If you don't, the moisture will migrate thru the cement and break the bond of epoxy to the concrete. A good friend had a house built and didn't do that and within 1 winter, big patches of the epoxy lifted. And it was applied by a professional installer. I don't know how this would apply to floors in other areas of the country, but that's what is recommened here in the Pittsburgh area by installers.