I sold my 999 and kept my S4Rs for street use. No contest, for me. The riding position of the 999 (and the other superbikes) is optimized for the track. The Monsters are optimized for the street. Plus, you can change so many things on the Monster to make it fit you perfectly. And it will be more comfortable for your wife. And it will cost less to buy. And it will cost less to maintain. And if you drop it, it will cost less to repair. And, frankly, a 4v Monster on the street is way more fun than a 4v superbike. Wheelie fun!! The roles are reversed at the track. Racebikes for the racetrack and streetbikes for the street; everyone is happy!
Why not find one of those BEAUTIFUL S4R's what came with a white frame, dark blue bodywork, white wheels and stripes? Those things ROCK and I've seen them for as little as $6k in perfect low mileage condition.
Tim
LOL, I believe you are referring to the one currently in the monsters for sale section? I have been looking at that one for sure.