Clearview 9.5" for me, 6'5" and lovin' it.

 

6 1/2 Clearview for me 6.0 foot 32 inseam danny gray butt crack seat rear lowered 1 1/2. Works perfect.

 

I went through the windshield selection process early this summer for my RG. Best advice I can give is call John at Clearview, explain the details to him (seat style, your height, inseam, etc) and go with what he suggests. I found him great to deal with. He recommended the medium +1 and it works fine.
Note also that several members here have had good luck with other w/s brands too. It is a particularly unique thing to find just the right one.

 

I have had several, the LongRide is smoother than Clearview.