If I only had one set of rims, I would probably stick with all-season tires. However, if you have aftermarket rims, chances are you have high-performance low-profile tires that even if they are rated "all season" aren't going to be very good on snow. When I bought my new rims and tires, I also got a set of snow tires (Blizzaks) put on my stock rims. They provide a huge improvement in handling on snow and ice compared to my Toyo Proxes. Even if you only have one set of rims, I'd probably still recommend getting a set of basic steel rims with snow tires if you do a lot of driving in the snow. I just wouldn't recommend swapping tires with one set of rims.