Just go to tirerack.com and look to see what sizes are available.
The ideal way is to have two sets of rims/tires, one for summer and one for the winter. Some people can't afford two different setups, don't have the space to store another set or don't want to bother with switching back and forth so they go with all season tires as a compromise. All seasons are not as good as a dedicated snow tire but if you get a decent all season tire combined with the awd you should be ok.
What size are you looking to get?