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Thinking about scope options, your best bet is to list your target priorities and local limitations then extrapolate your required specifications from that...
Eg:
Primary targets: wide emission/reflection/dark new vistas
Local limitations 2~3 arc sec seeing at best.
Camera is qhy9 with 5.4um pixels
Scope requirements:
<600mm f/l to match pixels and seeing conditions
F/5 or faster for dark nebs.
Options :
6" f/4 newt.
Fsq106
E180ed newt
That's how I go about selecting scopes. Figure out what I want to do with the new scope, figure out what my location will let me do.
Figure out what the optimal match to my location, camera and intentions are.
Compile a list of scopes within my budget that hit all those marks are then weigh up pros and cons.
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