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You would want 18": for 8" front 225-235/40-18 and 10" rear for 255-265/35-18". Then get real snow tires like Michelin Alpine, Nokian Hakkapeliitta, etc...
For rims, I say go for something used, or something that isn't super expensive - Enkei, OZ, etc. They're going to get gross and maybe a little beat up, so no sense in getting anything crazy. I've always done fine with OZ.