Like most have already suggested, and many more yet to, there are two choices, and eventually both will be needed.
Get a ToUcam, and webcam the lunar/planets. It is frustrating, but hellava good fun at the same time, and there exists a wonderful network of knowledgable folk within this forum to steer you in the right direction.
Once you have that sorted, get a cheaper DSLR, and my suggestion is a used 300D, or 350D. Most software is written with Canon in mind, and especially these two cameras. Used 300D's appear on Astromart for anything from US$400 upwards. They are simple to modify (remove the in-built filter) and easy to use.
Where the two will be needed is when you use the 300D for imaging, the ToUcam can be used to auto-guide.
Good luck, it is infectious.
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