Canon 1100D and Nikon D5100 are pretty good choices for mid-range cameras - the Nikon is a little trickier to use through a computer as you'll need a DSUSB cable such as those sold by Shoestring astronomy in order to have live-view.
For the money you have you could get one of these "off-the-shelf" modified for astronomy (replacing the filter than normally blocks the near-IR light from nebulae).
Or if you plan to do a lot of daylight photography with it too, then maybe a Canon 600D would be a decent choice.
Hope this helps,
Cam
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