Just buy four decent snow tires and you'll be all set, like some speed rated Blizzak LM25s. It is after all a rear wheel drive car. Its funny how times have changed. We've been driving front wheel drive cars for so long, people, particularly the newer generations, have forgotten there was a time when cars were primarily rear wheel drive. I can still remember as a kid, my father would put on snows on his Olds Cutlass in the winter.
Here in the northeast right now, we're doing alot of winter tire change overs. We're changing over LS400/LS430/LS460, GS, IS, etc.