After hours of research, I still haven't really narrowed it down to any particular shield. There's some nice stuff out there, and prices range from $300 - $600. I'm pretty sure I'm looking at a shorter shield. More sport than touring.
So to clear my head, I took the F3S for a nice ride, and did a little interstate 26. Beautiful ride, but my intention for the ride was to re-evaluate the need for a shield. As I was riding and thinking this over, I wondered if a reverse trike like mine has less turbulence at the rider position than a 2 wheeler has. Due to the fact of a much larger frontal mass. My conclusion is very much so. I really have minimal wind and or buffeting at hwy speeds on the Spyder. Not sure if I'm scientifically correct here. What I have determined is that the way I ride I probably don't really need one. I'm still thinking about a shield like the BRP Route 129. I also wear a full face helmet, and I think that helps too.
In 1980 I rode from Mobile AL to Eureka CA. On a 1979 Harley XLCH, no windshield, half helmet and sun glasses. Of course I was 23. Getting softer now, so maybe just a little help in the wind dept might be nice.