I have had a 4x100 conversion for months now, still working on the car so not driving it.
15x9 track wheels, 13lbs, roll formed, very strong, $131 each!
17x7 street wheels, good quality, low cost, 16.8 lbs.
I like the 15's so much I am thinking about selling my 17's, brand new with the best Michelin AS tires, and I have a set of 4x100 rotors I would sell with them, the savings would easily pay for the hubs so then all set!
The only thing holding me back is not being able to fine a superb all season in 15's, just some decent ones but the Michelins are as good as many summer only tires but all season and last a long time.
Many many wheels in 4x100 for great prices.