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Henry,
Sorry, I don't know anything about the Sky-Watcher DOBS. My advice is don't rush in, ring around and do your homework on prices so you get what you want at the right price. If you intend carrying it about in your car a collapsible or truss telescope makes a lot of sense. I have a 12" Meade Truss DOB which I am happy with.
If your Sky-Watcher 12" comes with 1.25 inch diameter 25mm and 10mm eyepieces, this will give you magnifications of 1500/25=60 and 1500/10=150. I'd forget the barlow. A x2 barlow will give you magnifications of 2x60=120 and 2x150=300. 120 is not that far from 150 and atmospheric conditions are rarely good enough to get decent viewing above a magnification of 250.
If you want a higher power I'd go somewhere nearer 200 to 220.
Instead of the barlow, I'd invest later on in a good 2" wide angle eyepiece. With telescopes, it's mainly about aperture size (the 12" is good) and not so much about high powers.
With truss telescopes and I assume also with collapsibles you will be doing a lot of collimating. You can use a laser collimator for alignment but I prefer a cheshire (cheaper at Andrews) for the final alignment.
All the best on your quest!
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