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I'm getting more into taking portraits and have done a few weeding (with more to come), currently I'm shooting a pair of 40Ds with 17-40 f4, 28-70 f2.8 and 70-200 f4 lenses. I keep thinking about buying a better camera (not an option right now but it might be soon) but am not sure which way to go. So my options are either a 5D, 1D mk III, a used 1Ds mk II or a 5D mk II, what do others think?