Some zooms these days are getting pretty precise - look at UF's work with his Beast. I find the choice is one of attitude and shooting style. Well, and maximum aperture.
Primes suit my 'for fun' style (walking all around a jubject, shooting at night, smaller lenses), while zooms are better for working because of the time and effort savings in not needing to move as much and not changing lenses.
Oh, and PS, you don't need an expensive 'scope for the moon. A 6 dobsonian (around $250) can do marvelous photos of the moon (and let you see avarything.) You will, however need something that tracks the sky to photograph anything less bright than the moon though. The work you've done with your camera lens though is really marvelous!