215/45/17 is far more common than 215/40/17 and you can get some really tasty rubber, e.g Michelin Cups, Conti sport contact 5's etc. at reasonable prices.
If the scrubbing is minor on the rear bumper you could unbolt the rear beam and move it as forward as possible. There is nearly 10mm of play in the fixing to allow the beam to be aligned with the chassis..