Here is where we have a slight difference of opinion Steve.
I feel the seat is the first priority as once your ass is comfortable you can then buy the windscreen that fits your needs without having to buy another windscreen after getting your butt comfortable and finding the windscreen to high or to low. Then the handlebars(Helibars) for the perfect fit.
I have always recommended Saddle, Shield, then bars in that order to get the best fit with the lest amount of "Trial & Error".