I would for sure go with a smaller wheel maybe 15 or 16. That way you can get better tires with more tread which is better for the snow. I would not go bigger at all. Her is a list of other jeep wheels with the same lug pattern. Maybe you can find some on a local craigslist or maybe e-bay or something.
5 on 4.5", 4.7" back spacing. Same as:
87-95 Jeep Wrangler (YJ)
97-06 Jeep Wrangler (TJ)
04-06 Jeep Wrangler Unlimited (TJ)
93-98 Jeep Grand Cherokee (ZJ)
84-01 Jeep Cherokee (XJ)
86-92 Jeep Comanche (MJ)
02-07 Jeep Liberty (KJ)
2007 Jeep Compass (MK)
2007 Jeep Patriot (MK)