These are the brake reduction clips I used. There are other sizes available; not sure what size works on the Metro.
Ebay has the Bridgestones for $149.99 for two, which isn't a bad deal. Costco sometimes has them for $250 for a set, including mounting and balancing.
You're right about the bolt pattern - 4x114; I just looked it up. Bummer on that. Smooth wheel covers would improve the aerodynamics of the LSi wheels.
155/80R13 tires are pretty cheap ($40/ea?) and they will also provide taller gearing and the sidewall will help ride quality.