I can tell you with my 18's and 215/35/18 on standard suspension the ride isn't that much worse than 17's but the steering will however take a few miles to get adjusted to. After I mounted the 18's the car seemed a bit more "darty" as if the road was steering the car, I hear this is normal with these size tires. Once you get accustomed to it you should be fine. I drive mine in New York City and have no problems.

BTW I run 35psi of tyre pressure.