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Dobsonian is no good at all really for nebulae and galaxies.
Even if it tracks, the objects will rotate, so you can't do long exposures.
So, for long exposures you will need a solid equatorial mount, like an EQ6, CGEM, iOptron, LX800 etc.
I find newtonians a pain personally, because of their long length, and the camera gear mounting on the side which makes flex and balancing difficult, and you have to collimate etc. But bang for buck they are good value and you can get great images.
A HEQ5 is not worth it to me, pick up an EQ6 second hand for the same money as a new HEQ5, and you really won't have to upgrade later, and once you start adding camera gear, guidescope, guide cam, coma corrector, reducer, electric focuser etc. you start to run out of the HEQ5 weight capacity in a hurry.
Many people image with Newtonians though and get great results, but I find SCTs or refractors a lot easier to manage.
If I was doing it, I'd get a 4" refractor on an EQ6 mount. Easier to manage, good wide FOV for the big nebula targets, lovely pinpoint stars, easy to attach gear and balance the scope, good resale value if you don't like it.
Then you will have a rig to learn on, that can take professional level photos and can grow as your skills do. You can always add a newt or SCT to the EQ6 at a later date if the bug takes you and you want to image those smaller galaxies or do some planetary.
A 4" refractor can also do respectable planetary with a 5x powermate, and do a fantastic job on the moon as well.
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