Welcome to Ice in Space Graham!
In my opinion, a 6" scope is just starting to make some things look interesting - planets, globs for example - and 8" catches some welcome extra light without becoming overwhelmingly large. Of course that's a personal thing though.
If I were you, I'd keep an eye out on the classifieds and lookout for a 6" or 8" scope - Dob or SCT. Examples are the Nexstar 6SE or 8SE, Skywatcher Synscan Dobs, or Meade LX90. They do come along every once in a while. The Skywatcher Synscan system is very similar to the Nexstar.
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