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The 550D,7D and 60D use the same 18mpx sensor, you can choose based on features. The 550D has the best IQ/price ration, the 7D has the best functionality. The 60D is in the middle and is the only one with a movable LCD.
The 5DII is 22mpx and less noisy, if you take night shots then there IS a difference.
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