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Hello Nick,
The Canon DSLRs have a very good suite of software which allows third party developers the ability to write applications which connect to them and use them as part of the app.
Nebulosity, Equinox and others come to mind here. Nebulosity is a very good capture program, which I use.
Low light performance (i.e. ISO > 1600) is important.
But the killer feature for you will be Live View, which allows you to focus your camera/scope in real time using a tether to your laptop. This cannot be beaten as a must have feature.
The cheapest Canon with Live View is the 1000D. It has an 11-bit A/D engine and ISO 1600. If you go to the 50D you get more bits (= good) and more ISO (= good).
Regards,
Tony Barry
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