In that case, i like the dunlop wintersports. As for size, it will probably be easier for you to find someone's used 16 inch wheels at a good price than 15s since they are more abundant. Check your local craigs list for Subaru 16s with 5x100 bolt patterns and find a set that are in good shape. lots of people ditch them to go to after market wheels. They came on a number of Subaru models in different styles.