You could always start with the dart. They're inexpensive and do deflect a lot of wind while still looking pretty darn cool. Later on if you feel the need you could move on to a larger screen however a bigger screen does not necessarily improve things. I run with a Memphis Shade Speed Demon but had to add lowers to get rid of buffeting around my head. Now it's a pleasant and relatively wind free experience behind that screen and I love it.
