Advice on changing from stock 14 inch rims and spacing

I think you are smart for not going with the 14s. First off, these cars look better with a little more rubber and secondly, 14s are drying up. Just a thought here, why not look at all the different 15" dog dish hubcaps and see if there is one you like? That way, you could simply go with some factory wheels of some kind. Look at the slotted cop car wheels, for instance.