Well for what it's worth, I added 195/50/15 Yokohama S.Drives on 15x6.5 (+38 et) wheels, and it made a huge difference handling in the corners and felt more planted on the highway, too. Unfortunately, the 195-wide tires are a bit too wide for me, since I cannot carry a passenger without rubbing, and you can forget about having a rear passenger. I'm considering sticking with a 14" wheel and tire setup, but possibly going to a 175/65/14 or 185/60/14. Also pondering a 15x6 or 15x5.5 wheel and 175/55/15 tires, although they're rather pricey for what you get.