CUPERTINO (AP) — Apple Watch comes with a choice of watch case, band and size — there are 54 possible configurations in all.Most models come in two sizes, 38 millimeters and 42 millimeters, as measured by the height of the watch face. The larger one costs $50 more in most cases. For a few of the bands, only one size is available.There are three lines to choose from:u The cheapest is a “Sport” version with an aluminum case.