The secret to good imaging is to get the best mount you can and don't overload it. The OTA's available today are all quite good for imaging but some get better results than others. A 12" OTA will require a very heavy duty mount probably costing much more than you are prepared to pay.
A good 80mm refractor with a 5" or 6" newtonian on a EQ6 mount using one or the other as the guider will probably give far superior results for a beginner
Barry
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