Dunno if all of you are tracking this detail, but the governed top speed changes when you go from square to staggered summers. 130-155mph. Not so big a deal in the states, unless you track it, but over here it's a big deal (at least to me).
Oh, and my winter set up is square black 17s. If you size the tires right, the overall diameter is almost identical to the 19" bmw rims, and doesn't look too bad either