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As Steve said above, the best thing you can do to enhance your deep space object observing is to pack your scope into the car and go for a drive away from city lights. Especially for low brightness extended objects such as galaxies and nebulae it makes a world of difference what you can see when viewing against an inky black sky sky as opposed to a milky grey one. From my outer suburban Melbourne home, I can only see the core of the brightest galaxies and a bigger scope wont help that.
The best upgrade one can do to a dob for dso work is to fit digital setting circles such as Sky Commander or Argo Navis. They are a small computer which allows you to select an object you wish to view, and it guides you to the object by telling you which way to push your scope.
Getting a scope on an eq mount is counterproductive to the portability aspect and for visual observing, the added weight, complexity and lesser sturdiness of the mount compared to a dob is a royal pain IMO. If tracking objects at high power is hard with your scope, spend some time on modding your scope to get the motions nice and smooth. There is plenty of info on the net about methods to achieve this.
My recommendation is to learn to get the most from the scope that you already have, before shelling out for things that may not be what you really want or need.
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