Put another way, if you buy a FF camera but then have to crop all your images to 1.3x or 1.6x FoV, you're throwing away the IQ advantages of FF over the smaller sensors, and so you might as well just get the cheaper camera (from an IQ standpoint). Conversely, if you only need to crop a few of your images, the IQ with the FF will be a decided advantage. That might mean getting longer lenses to compensate for the loss of 1.3x crop...which suits Canon just fine...
Neuro - this was well stated -so true.
Like some of you, that Spot AF is a necessity for me as well. The 7D spoiled me on this and it's availability with all lenses. It's a must have. Does anyone have a tally as to which currently available Canon DSLR bodies have this feature on FF for all lenses?