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I'd go for the dob 6-8" but lean toward the 8". It will give you heaps of objects you can view (I tracked down a mag 10 galaxy last night with one) so you will never run out of things to look at. It will give you an upgrade path that is not too hefty , up to the 12" sould give you an extra magnitude of light grasp in future, if you decide to go that way.
It cools relatively quickly (about 40 minutes should do it), it is not terribly heavy (I can carry mine in one unit but it is easily taken apart for travel in a car), it will go on a loading trolley for moving around the backyard, it is an f6 so it is a bit easier on eyepieces than a 10" so cheaper eyepieces will work in it better (if you are a casual observer then you won't want heaps of money sitting in the corner gathering dust most of the time), easy to collimate and with a Telrad you probably will not need DSCs (I use manual setting circles I made on mine).
All up an easy to use, relatively small investment that will give you years of pleasure.
Good luck.
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