Have you checked out tirerack for a winter package? For a set of 16" steel wheels and good Bridgestone winter tires mounted and balanced was $476 + shipping.
You can also get 215/65/16 tires that are the same diameter but will give you a little better traction.
Just rememeber to buy 4 snow tires, or 4 new good all season tires.
http://www.tirerack.com/snow/changeover....r=&autoModClar=
_________________________
03 GT, STB, GM HD sway bars, 35% tint, GE893(37watt)fogs, Flowtech Terminators, 180 T-stat, ZZP DP & PCM, Ceramic PLOG & Crossover, 18" glasspack, 2007 17" Mustang Bullits 235/55/17 Pirelli PZero Nero, 12" R1 D\S rotors, gutted air box, GTP radiator