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Taking the 12" Dob out to a dark location in your 4x4 sounds near perfect for deep sky. Refractors can give good resolution (especially on close, double stars) and a nice image quality, but really for deep sky, aperture is the key to seeing more. When U can afford more, I would suggest upgrading the eyepieces.
I write this on the assumption that U have cut your teeth on current Dob and have located a number of globulars and galaxies and are now ready to progress to the next level.
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