Just go with the OZ Supperleggera in 17in., they weigh 15.4 lbs. and a 215/45/17 should give you plenty of protection. The rim retails for $280 per wheel from Tirerack, so it's already cheaper than you expected, plus it'll look much better than 16's. I weighed one of my wheels last weekend full of air, it was 42lbs., so this would be a substansial loss in overall weight.
