215/50R17 is way too big. Stick with 215/45 or 225/45R17 for 17x7" rims.
Just make sure to get a quality rim to minimize pothole bends. For the ride quality, pick an appropriate tire. If you don't need ultra high performance, maybe a softer V or H-rated tire will be good. Check out the survey results at
www.tirerack.com as noise and comfort are categories.
Aaron