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There is a third option that I nearly forgot about- Maksutov & Schmidt cassegrain reflectors.
There are a few sizes that may be convienent around the 4" to 6" range, and also useable on either a simple mount or totally automated.
Again, Andrews web site contains the major cassegrain producers, Celestron, Meade & Skywatcher.
These can also be used as terrestrial scopes too, and are a much better optical design for high power use than the short tube refractors, though more expensive. There are still options that will fall within your budget.
I started with a Celestron C5, a 5" Schmidt Cassegrain, nearly 20 years ago. I still have this scope. I love it. It can sit on a photo tripod very comfortably too, or I can stick it onto its eq. mount to track. A very capable scope.
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