I just got my Xb 08 yesterday and I am planning on replacing the steel wheels in the spring of 08. I would like to keep the tires on the steel wheels for a winter set and run the nicer wheels in the warmer months (snow/salt around here. Since I want two sets of rims/tires, I will have to purchase the air pressure sensors for the new wheels which might get expensive.
My dealer has a service program plan (12, 24, 36, 48 months) that will allow me to purchase the Scion alloys with a 15% discount. I might find a better looking wheel or a better deal between now and next spring.