Thanks, everyone!
Will try to find some 17" wheels to put on and try out. Don't know what shop will be crazy enough to let me do that, but it does seem to be the way to go to avoid changing the car too much.
...hmmm, except that looking it up right now, OZ (producer of the Ultraleggera and Alleggerita wheels that I wanted to get) doesn't make any 17" with 5*130 mounting.
