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With Nikon the 7000 series are the ones to aim for. Anything less you will want to upgrade, they are finally the camera i waited years for Nikon to release but ended up getting a D800e and still tempted to get a 7x00 for just astro work.
Never used Canon, but the distance between the rear of their lens and the focal plane differs significantly from Nikon allowing Canons to have clip in astro filters. As a regular camera i dont think there is any real difference between canon and nikon at same price points, both can take great shots, both take better shot when you use good (non-kit) lenses and learn how to take photos.
Sony I would be reluctant about, as regular cameras they are fantastic however as has been recently proved the way Sony handles data there is signal loss even in their RAW formats. It's irrelevant for regular photography but effects signal quality in astro work. Depends how you are capturing, processing and using the shots too. How serious are you with your shots? Sony's benefits may exceed the issue far enough that you won't notice it though, I'm just glad I didn't impulse buy one.
Whatever you go for, should have live view and if you can get a good 70-200mm lens f2.8 or f4 and avoid the kit lenses. Canon and Nikon have equivalent offerings and a good 70-200 lens is pretty much in every pro fessionals kit, the kit 70-300mm is vastly inferior in every way. Some people are happy with that level of lens but you are better off buying the body on its own or bundled with a good lens ( some dealers will give you a discount, kit lenses are pretty much unsellable second hand.
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