17-inch steelies are heavy and will add substantial unsprung weight. It's better if mount them on alloys. Expect dealers to sell you OEM winters which would cost +/-$2000 promo pricing. (sample:
http://www.jasonkwan.ca/?p=313)
Here's a good compromise:
- get replica alloys (+/-$600)
- get non-OEM winter RFTs (+/-$800)
- bring along an air pump, for top-ups.
If one of the tires is low on air, the TPMS will go off. If safe, pullover then top-up then bring to nearest tire shop for replacement or repair.