Hi, mommabear,
I just two weeks ago bought a GT300i, and the only negative thing about it was the lack of a windscreen.
I bought an Airstream Scooter66 windscreen, and from what I can tell it's going to be a very good wind blocker. Although I've only had it mounted for three days,,the riding I've taken with it has been very positive. The way I've adjusted the mounting, the screen clears the headset by probably 1", but that's working out very well for me. I look over the screen so I can see the roadway approx. 30' ahead (I'm 6' tall).
The model 66 looks much better than the photo of it on Amazon's site, and I think it was under $80 shipping included.
Karlu
Las Cruces, NM