I have the 24-105 and love it - great lens - definitely the best I have owned. That being said, while I appreciate the extra length, it is not wide enough in many indoor or landscape situations. I often debate selling it and buying one of the 17-40 or similar range lenses plus an 85 1.8 for low light and portrait work. Heck, might even be able to squeeze in a 30 1.4 for a little more cash...but then I would have to carry two or three lenses instead of one...
No matter what you decide you will have doubts and probably change your mind
You have started down the slippery lens slope!!




Huh?...FF 
