I'm contemplating on upgrading my current wheels on my E30 for something else as soon as I require a tire change. Currently, I run 195/65HR-14 tires on the stock bottlecap eyesores. Originally, I wanted to get 16" rims, but someone mentioned to me lightweight rims and was recommending them. I've seen quite a few other E30's with 15" rims, and while I don't think they look all that good on 'only' 15's, I wondered if there really is a performance difference in getting lightweight rims. Would the performance impact be noticeable? If not, would someone be able to recommend anything for 16's? For reference, my wheels are 4-lug. I've seen adapters on eBay for abour $130; anyone know if they're worth buying?