A lot of the options depend how tall you are. I am 6'4" and I went with the Parabellum 26" windshield. It worked great especially with my Icon Variant helmet which is a very noisy helmet. What I like about Parabellum is for an extra, I believe $50, they will send you their shorty screen. Ive been using that during the summer, on the open road I get a lot of clean air and very little turbulent air around the helmet. My one issue I get with the shorty is when I am behind a SUV or Van I still get the turbulent wind around the helmet (could be because of the Icon also). Install was very easy took about 15min.