How important would astrophotography and portability to you?
If you really want to take long exposure images then a APO refractor and a EQ mount would be the best option. If it's a secondary concern and you want to go the mostly visual route an 8" SCT on an Alt-Az is an option.
I have the Celestron 8SE and it's extremely portable and doesn't take up too much space. It's easy to setup and tracks well. The downside is that it isn't suitable for long exposure photos, although some people do wonders on DSO's using stacked 10sec exposures.
Something else you need to keep in mind is that unlike the Dob, these setups will require power. So you need to leave room in your budget for a suitable portable power supply.
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