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7D, as this is enough of an upgrade to justify buying a new camera in my opinion, if you feel you really must.
60D has been downgraded, at least in terms of build quality and some features, as expressed by Donoreo above.
50D, only thing compelling about it to me, is it has the ability to allow you to correct for front or back focus issues with your lenses. Otherwise it's an older generation camera, so why bother with a 1-gen upgrade? Also, at the time it came out, I remember it was it was not as well received as say the 40D was compared to the 30D. Image quality was one of the things I recall being considered less than stellar on the 50D, because too many pixels (15 MP) were packed onto the sensor (and Canon hadn't worked out all the issues with smaller pixel sites at that time). Some reviewers were saying the 40D had better IQ than the 50D because of that.
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