I believe the Geolanders are an all-season radial. Your profile doesn't indicate where you're from, but if you expect to encounter any snow at all, I'd recommend a snow tire if you're going the dedicated winter wheel route. Bridgestone Blizzaks and the Michelin X-Ice are both good tires.I have a 2013 Platinum with the 20 inch tires.
I was thinking about getting 18s for the winter with steel wheels. Specifically I was wondering if anyone has any thoughts on Yokohama Geolander I/T G072?
Anything else I should consider?