My two cents worth: the Canon 20D is an 8.2 megapixel camera. Most modern DSLR's from Canon / Nikon / Sony et al start at around 16 megapixels.
This gives you a lot more resolution to work with for AP. This in turn will give you more scope for zooming and cropping your images, and allow you to take pictures at lower magnifications which in turn means brighter images, shorter exposures, less tracking error..... etc...
So, all things being equal and ifthe budget allows, go with the 60D (16.2 megapixels).
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