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If you're still interested in visual then a refractor really isn't going to satisy.
If your aim is imaging then probably the easiest/cheapest way is to utilise your dob tube on an equatorial mount, an HEq5 or Eq6 is really entry level.
You may need to make some slight mechanical adjustments to your Dob OTA to achieve focus with a camera.
You'll need a small cheap refractor for a guidescope, some form of autoguider, a simple webcam will do the job and something like a Baader MPCC for coma correction.
Then you'll need a Camera of some sort, if you already have a DSLR then you're half way there, a modified DSLR or dedicated Astro camera will be even better (at a cost).
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