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A few other considerations:
* LiveView: I didn't miss it when I didn't have it on my 20D, but now that I have it on my 5DmkII I find it indispensable. Focusing on stars at night is much, much easier.
* Depth of field: given the same composition (e.g. 50 mm on crop vs 80 mm on full-frame with the same subject distance), the full-frame camera will have 1 1/3 stops less depth of field. For instance, f/1.4 on crop gives you the same DoF as f/2.2 on full-frame.
* Lens choices: since crop cameras only use the centre (best) part of the lens, it's easier to get cheaper/better lenses. If money isn't a consideration, then ultra wide angle lenses such as the Canon 14 mm or Nikon 14-24 are fantastic for full-frame.
* Telescopes: scopes and flatteners that can properly illuminate a full-frame chip are more expensive than ones that work for a smaller APS-C chip.
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