pilot powers are a fav too, just remember if you are replacing stockers with some of these others, the profile of the tire is way different. They allow for some much quicker turn ins on corners but can make parking lot maneuvers a bit more interesting the first few times out
The extra width of the 200 will slightly decrease handling if u like curves, were as dropping to a 180 will make it feel as it turns a little quicker.
It's all according to preference. I am personally a Pirelli Fan. I can not wait until their new Diablo Rosso corsa's come out here in the US. They were released last month in the European market in all sizes. They are a beautiful tyre and supposedly the perfect ALL AROUND tire.