Hi Greg,
While waiting is appealing, especially with new electronics, I reckon sort out what you desire and grab it. Otherwise you'll get old and still be without a camera.
I loved my 20D, but went across to Sonyba while back, not for astro use though. I am however enjoying the odd shot or two with both the Sonys I have so get the 5D if that is what takes your fancy.
Nikon? Lovely film cameras, but I reckon with all the astro software being designed mainly for Canon, go with them.
Gary
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