That big barn door that Flying Dutchman has on his bike may be an option too. I've got the same problem you mentioned. I can't read the signs or see what's in my mirrors with the stock screen. 30 minutes of riding yields a horrible headache.
I wish there was a way to sample all the screens. The Givi is cheap (compared to others), and I'm sure the offerings from Cee Baileys and BMA are going to be top notch (when they hit the market). I am not so much concerned with getting tons of airflow (while it's nice), I just want smooth air. I've had the bike over a week and only have 600 miles on it! I did that in 2 days on the RT!
Life is either a daring adventure, or nothing