Honestly, i feel choosing a camp to stay in forever is hard, theres always temptation ( L Lens, Trinity, Better Flash system etc).
So choose one which u are comfortable in and read up on both sub-forums what problems do most user of that Cam Model faced and what are they satisfied with.
From then on. you can easily make a choice becos u will know the rpos & cons of different camps.
IMO, choosing C or N over the range of lenses is pointless. L Lens? Nikon Trinity? Are u a professional who require such High-End Lenses? Im certainly not one, so im just happy with my third-party Tamron 17-50 Lens.
Regarding the range and focal length blah blah, Humans are flexible, Lens too..just that it will burn your pocket.
Good Luck on choosing side which you will never turn your back against!