Depends on how much your gonna drive in winter. Id get tires from a good site and gasp... get steel rims with maybe a cool looking hub cap if it was just for a couple months.
are they the stock wheels? you should see a marking near the center of the wheel (visible while the wheel's installed) that will say 10 x 18 or something to that effect. if they're the stock 17" twists, i believe they're 9" in the rear and 7.5 or 8" up front. if that's the case, you can run P225's in the back and P205's up front.