Hello there and welcome to the mini side of the forum. I tend to go on another forum for most of my mini related questions as it is a mini specific forum. 17" down to 16" seems to be the trend at the moment, and deffinately junk the run flats. For spirited driving, most people tend to go for either team dynamics wheels as they are pretty light, or wheels made by a company called rota. Again, these wheels are nice and light. The reason behind choosing lightweight wheels is that the weight reduction improves the handling a lot. Most people tend to go for a tyre within either 205/50/16, or 215/45/16. Again, with ditching the run flats, a tyre like the Federal 595 RS-R you will get a more forgiving ride, with plenty of grip, and no an excellent tyre for grip in the wet. When going with non run flat tyres, this gives you a feeling of a softer ride, which then means you can slip on a lovely set of coilover suspension and lower the car to improve the handling even more. If I can recommend you one place to have your mini worked on, it will be Minicraft down in Sussex. They charge a lot less per hour labour than anywhere I know, they run a 480BHP R53 mini which is their old Time Attack car, and also run a 300BHP R56 mini in this years Time Attack series, so they certainly know what they are talking about with regards to minis. Any more questions, p.m. Me.