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If your dob does have a rack and pinion focuser you might consider getting a low profile Crayford 10:1 focuser as it will greatly increase your focusing ability. The low profile one will also assist if you want to attach a camera later.
Re using a 12mm with 2x barlow as against a 6mm. I don't know the optics but I have found the combination much easier to use, something about eye relief and exit pupil width ? I was looking at Saturn tonight with the C8 which is around 2000mm with a 2.5x barlow and a 23mm eyepiece very nice, seeing wasn't good enough for a 12mm with the barlow, and the 12mm by inself wasn't as easy to use as the 23mm and barlow.
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