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Hi. I have a 90mm x 1200mm refractor having recently sold my 8" dob. I like the focal length of the refractor, the lack of maintanence, and being able to take it into dusty locations on windy nights with little or no cool down time. Perhaps you would consider the 102mm x 500mm achro on an az? I find that is my best grab and go, and that it works great with high powered eps (3.8mm, 5mm, 6mm) You could achieve these powers with a cheap ED GSO barlow. The 102mm also gives great low powered wide views.
If you can mount either the 90mm or a 102mm on a GSO or Vixen porta mount, then you will be in 'grab and go heaven' as far as zipping around the sky at full alt /az goes. I have dovetail bars on my 102mm and 90mm and they work great on the GSO Vixen clone.
You could get a 90mm refractor cheap on ebay and tip the savings into a good GSO or Vixen mount.
Other wise, the dob is cheap, light, and has more light gathering power as you would be well aware. They take up a lot of car space though. It's tough call. Best wishes!
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