For warm weather, I like this one:
I think it's Cee Baily's, stock width, -3in shorter than stock (not 100% positive since it came with the bike). With it all the way down, I get clean smooth, air on my helmet and plenty of airflow on my arms and chest, which is good for keeping cool. I keep it full down all the time except when it's raining, when goes full up and does a decent job of keeping the rain off my torso, but it's somewhat noisy and turbulent at the helmet in that position.
[FWIW, that's a buddy of mine in the picture who I swapped bikes with for a few hours on a trip recently -- he's from South Africa and normally rides BMW dual sport bikes. He owns an F650GS, an R1150GS, and an HP2, so I lent him my V-Strom for the trip, which he thought was just OK, but he had a huge grin on his face the whole time he was riding the FJR]
When the weather gets cooler, I like the tall Calsci:
Full down it provides excellent protection for the torso and is acceptably quiet at less than highway speeds. On the highway, running it up about half way eliminates almost all wind noise. But there's simply not enough airflow behind it for summer use in any position, i.e. it's too hot. It also seems to affect the airflow down low making the heat from the engine more noticeable on the legs -- great for cooler weather, not good for warm weather. The edges are a bit rough and could use better finishing, but I have no interference problems.
I have no use for the stock shield at all. For me, it's turbulent and noisy in all positions.
I would try the V-Stream, but I can't get past the looks. Sorry, but it just doesn't look like it belongs on an FJR.
-Uwe-