I am also eying the 5DII or probably 5DIII or whatever full frame camera Canon may come up with.  The 60D is certainly no piece of crap.  There were a lot of disgruntled 50D owners who didn't like how Canon decided to evolve the prosumer series with the 60D which was smaller, had no micro focus assist etc...  In the end the 60D turned out to be a fantastic camera, a sort of super Rebel.  The 7D was the next step up for XXD series users.  I decided to get one, and meh, I'm not in love with it.  I don't really take a lot of airplane pictures anymore.  At least not spotting ones where long telephoto lenses are needed.  I miss the depth of field from 35mm and that's why i will be going to full format.  Although the 7D will probably stay be my back up camera, or when I do need to zoom in.  So if you are a spotter and mostly use long telephotos, there's no real reason to get a 5D.  If you also do other photography like people and such, the 5D may be much more pleasing.  And Megapixels?  I'm over megapixels.  I don't need more than 12 megapixels.  I wish the manufacturers would spend more money getting better dynamic range and less noise rather than upping the MP's for every new camera.

For pure image quality, you won't see much difference between the T3i and the 60D.  It's really all about custom functions.  And you will get a little better auto focus with the 60D.  If you do a lot of sports and aviation, the better auto focus on the 60D might come in handy.  You do know about the Canon loyalty program, right?

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60D and XSi is a nice combo.  I now have 5DII, 7D and 20D.  Will be getting rid of the 20D though, doesn't really offer anything except a beater camera.  Like I said, I'm not a fan of the 7D.  I should have gotten the 60D instead.  Less money and probably same performance.