I just wanted to add that I have used 185/70/14 on the front for several years, and it definitely does affect the cornering, a bit extra ground clearance but no issues with rubbing ever. On a funny note the over optimistic speedo on our car (pretty sure i read around 6-7% stock) with these tires actually reads very close to correct with the larger tire
Of course the odometer is another story. For some reason I really like this larger tire in the winter when acceleration isn't a priority, it just pulls a little softer in the rev range and seems a bit better for control. I also believe that it improves fuel economy for ppl who do hwy runs to work, but that can be argued, and by improvement I mean like 0.5 - 1.5 mpg, but it adds up.