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Greg,
I am having difficulty working out if you want terrestrial, astro or a combination of both. I firmly believe that the two are chalk and cheese, and that while some use the one lens for both you will eventually get a lens for daytime use and a lens (or lenses) for astro use.
In my case, and I differ from most, I have a Sony DSLR, with a Zeiss 16-80 zoom. Sharp, wide range and all round usefulness. While I haven't tried it at night I simply plonked down about $80 and got a Pentax 6x7 200mm lens for astro use, and supplemented it with a friends 55mm Pentax lens as well.
Zoom lenses are good these days, very good, but astro use and CCD sensors strain even the best, so I opted for primes, designed for HUGE film sizes, and use the sweet spot in the middle.
Gary
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