If your a tall one, then longer screens tend to be a bit noisy in my experience.
I'm 6'1" and my last two bikes (fz1s and tiger 1050) have both posessed tall touring screens, and have been almost unbearable to the point where earplugs were even useless! I cut the touring screen down on my fz1, and it was still bad. I've now got a much shorter d/b screen which is miles better!
You can guage it by ducking your head down a few inches and see if it gets any noisyer, likewise raising yourself up off the saddle and see where the clean/quiet air is. Give it a go, and it might help you decide on what you need. Good luck: