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I'm not sure whether we should be chucking you in the deep end or not! (Lest you drown). Regardless of photography skills, astrophotography is a steep learning curve.
What sort of telescope skills to you presently have? Have you used one for visual?
Your D5100, is that IR converted or full spectrum? IR in AP is not that useful, although there is one fellow that does some IR. The D4, now that's a capable camera. One of the best DSLR's one could use for AP, though a dedicated astro mono CCD would be better, but completely different to use.
Skywatcher make a great line of refractors if you want to go down that line, from the ED80, to the ED100 and ED120. They also make Esprit APO triplets. I'm presently driving an ED100, probably more to do with budget otherwise I would have the ED120. Refractors are so darn easy to use, no mucking about with collimation, no adjustments, fast temp settling time.... They are just like using a big tele lens. The Nikon D4 and SW 120mm refractor would be a good combination.
But then GSO make really good fast Newtonian astrographs. Who wouldn't like 1000mm focal length at F4? Being a reflector they need collimation, and fiddling with, but if you can live with that they are excellent bang for buck.
Keep in mind that learning curve though. The bigger the scope the trickier it will be to tame.
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