I also have the "winter" screen.
I have no experience with the current roadster screen but they seem to be a little more upright than mine. Maybe that is why so many complain about the turbulance.
Here are some pics.
Stan's T-Bird
I have also been looking for a Summer screen for a while. Had the same idea as everyone else. I think it would be pretty cool to have interchangeable screens. I even found the plastic only once on ebay but got outbid.
Stan