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I think Dave raises some good questions to ponder re mobility.
- Do you expect to travel sometimes to dark skies?
- Realistically, how often could you do that, and how bitter and twisted will you be if it's cloudy on "your" weekend?
- Portability of gear (and how to best power). It's no good having top gear if you can't be bothered assembling it at home, let alone in the wild
I'd argue you can do some very decent astrophotography of brighter nebs and galaxies from the backyard, but obviously depends on your local environment, horizons, etc. A good light pollution filter or narrowband filters might be worth looking at too.
If you KNOW you'll be in it for the long run, a CCD is unbeatable but obviously reasonably expensive. Suggest a bit of research and thought too on what objects you enjoy to see imaged, and what sorts of gear people used to get good results.
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