A lot of it depends on what tires you get. I run 17" OEM style 285s on my 328i with a square setup (225/45R17) on summer tires and I feel it is the perfect combo for ride, handling, and acceleration. I drive my car hard on the twisty backroads that also have some pretty shitty pavement in spots, and it grips well, even on Tail of the Dragon in light rain. My previous tires were Continental Extreme Sports, and currently have Michelin Pilot Sport AS4's. Both work very well. The downside in my opinion to the larger wheels is the car rides like garbage, the wheels are heavier making for more weight on each corner, and the tires having a smaller sidewall are more susceptible to damage.
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"Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should."
-Dr. Ian Malcolm, Jurassic Park
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