It's noticeable, but I usually ride half tuck or just under the slipstream so it's not that bad. It was the first thing I noticed when I pulled on the 401 out of Endras. Coming from an R1 I felt naked against the wind, but just like anything else, you'll get used to it and I barely notice it now. From the sound of riding you want to do, I'd say look at your choices for upright as it may suit your needs, the choices you gave and the bikes the other guys put up are nice options. I've came up with SS and I'm not ready to give up on it just yet. I've been eyeing the ZX14 or even a GS for a long distance touring, but I think I'll always have an SS in my stable.
The bike is great, the mechanics and the power delivery is awesome...it is a riders bike in the sense it will let you do what you want and give you the assurance that you need and you can go the distance. The heat is an issue as well as the small screen. But, small price to pay (or just wrap the metal and get a longer screen) and you can do it all.