In my experience, naked sport-tourers are better for the longer distances than faired sportbikes. You get more room to move around, the pillion ergos are usually lots better, giving you a happy passenger at the end of the day, plus you can watch the scenery, which is part of touring, right? The only modification you have to make is to fit a small screen - enough to take the 90mph winblast off your chest but still leaving your head in the airstream. I've done a lot of two-up touring over the years, and for my money the naked bike with a small screen and hard bags wins every time.