You have a D3x

  • Like what you've gotStick with it
  • Dislike what you've got: Stick with it. Not exactly sure what you dislike (other than the price you paid), but the only possible upgrade path is a used D800/D800E or a new D810. You'll be giving up body build, vertical grip, battery endurance, and more in order to gain a flash and less than a 20% linear gain in resolution. 
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