I'm sure this has been covered a dozen times before but I'm really struggling to make a decision. I want to upgrade from my T2I but I still plan on using it extensively. I shoot mainly wildlife, old buildings, anything in nature. I currently own a canon 10-22, 24-70v1, 100-400L and 1 of my favorites, the 100 macro. I love the extended reach of having a crop sensor so I was leaning towards the 7D (although I do not shoot sports). I think all of these lenses minus the 24/70 tell me to go 7D. I think I would miss that extra reach if I went with the 5D2, but I do like the thought of better low light capabilities. I feel I'm a little limited on the crop sensor with my 24-70 but I can always back up. I was discussing my dilemma with a friend and he suggested a 5D2 with a 1.4 extender. Would that somewhat equal out the reach id be losing by switching to full frame? I would love any help on this.