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106mm is a good aperture for refractors. They give very sharp widefield images.
Wide field is easier in all ways to do.
The downside is a good refractor in that price range is expensive as they are hard to make with exotic glasses. The Takahashi FSQ106ED is the classic widefield imaging refractor. But its around $5000.
You can use cheaper 80 to 100mm refractors like Orion 80 and 100mm ED. They work very well. They are good value for money but the focusers will be a little weak. 80mm will keep you going for some time.
Reflectors are also great for imaging. Generally larger than 130mm and that is their strength. A 200mm refractor is large, heavy and costs over $24,000. But you can get several 200mm excellent reflector type scopes for under $2000.
Greg.
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