low profile tires on stock 15 inch rims... Why? All you would be doing is messing up your speedometer reading and fuel mileage and making it ugly. Get low profile tires when you get bigger wheels is what I say.
205/60/15 will have a slightly smaller sidewall, which is better, although not by much. It will make put your speedo slightly askew also. I'd assume that it really isn't worth changing sizes for such a small difference. I think Ratko is running 205/60/15, you could ask him.