Get a set of 4 steel rims and put Michelin X-Ice tires on them (or another good make).

This will prevent salt damage to your alloy rims and the X-Ice tires are amazing on my GXP.

I was worried that my V-8 would be unmanageable in the ice and snow, but the X-Ice tires help the Grand Prix to handle as well as my 4x4 Pathfinder ever did.

Hope this helps!