Unless you have money to burn, a DSLR is IMHO the best way to go, as an added bonus you can take daytime images, If you have the money the Canon EOS20DA is an excellent camera (Tony has one). Unfortunately the range of options you have listed is from a couple of hundred dollars for the ToUcam to upwards of $10,000 for the SBIG depending on model; the 20DA is around $3000 and has been developed by Canon for Atsrophotography. If your budget is tighter then the Canon EOS350D is also a good option at half the price of the 20DA, and can be used (and purchased) in it's standard form or modified specially for astro use.
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