I guess I should start out by saying that I have a definite V-twin bias, and that's why the SV is my obvious advice. However, I wouldn't choose the SVS. Buy the naked SV, get rid of the standard bars and replace them with drag-bars ($15 - $20 U.S.) then install a pair of Napoleon wrap-around, bar-end mirrors ($50 a pair) and you'll never have to look at your elbows again. For wind protection: there are several very good sport and sport-touring windscreens that can be had for under $100.00 (National Cycle comes to mind).
The benefit of this set-up is that with a few basic tools and about 5 minutes, you can go from putting around on a pleasant commuter to a hauling a$$ on a capable cafe' racer - all you need to do is change the angle of your controls.
Keep in mind that the SV's front end is very mushy: good for strolling, bad for strafing. You can have the front end shimmed and the shock-oil change to a heavier weight for under $100.
The above add-ons to the standard SV come in under $300.00 and - if I remember right - that's still less than what you'll pay for the SVS. In the end, you'll have a much more versatile bike and no expensive plastic to break. Of course, the Napoleons will be roached in a lay-down but you can buy them separately for $25.00 - they're interchangeable from side to side, so order 3.
One last thing: The SV has a monstrous after-market. If you cant find something, dont worry it will probably be available, sometime soon.