Aaron, just because you CAN run the 15" rim, take into account the overall diameter of the tire, and fender clearance. Also, what is the availability and size of tires your looking? The 205-55-14 is a pretty popular tire, Toyo, Avon, Hoosier, and Kuhmo all come in that size.

Looking @ the 15" specs from TireRack, the Kuhmo only comes in a 225 but the Hoosier and Avon do have a 205 in the 15" diameter.