Hi Nils,
With your dark sky I'd look at 10-12" Dob. 10" is a lot smaller than 12" on the portable front. Good idea not to mix astro photography with visual too.
Skywatcher make collapasable truss dobs that are very portable...I'd look for one of those. If your fit then go for as big as you can move around with relative ease.
Matt
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