Great advise. I totally agree. Go with your gut/heart. If you love the S4RS and think that it will really do better for you, get it. Sure, it won't be as aggressive in the canyons as the 848, but I can tell you from personal experience, a Monster is a far superior commuting vehicle than an 848......I'm dealing with that right now!
As a side story, my wife just went through this kind of debate. She is a relatively new rider, and thought she wanted a more upright riding position, and the superior wind protection of the Multistrada. After seeing the new 696 in white pearl though, she began to have doubts. Finally decided her heart was saying Monster, and her head was saying Multi.....went with her heart.....more excited about her new bike than I can ever remember her being.....which will be totally key to getting her our on it when it shows up!
Good luck!