I can't look at a picture of these cars without thinking of the crush I had as a kid on all of Charlie's Angels...
Regarding wheels, I would certainly advise trying to go with 18s if at all possible, there are not very many good tires to choose from anymore for 17" wheels. Plan on getting a custom set made to fit just right to maximize fitment.
Are those the 4 bolt lug pattern? If so plan on upgrading to 5 lug setup?