If you’re a cold sleeper, you should definitely look into getting an underquilt. Some people get by with a sleeping pad and a sleeping pad holder like one of these:
http://www.rei.com/product/830279/eno-hotspot-hammock-sleeping-pad-wings
This allows you to use the pad for sleeping in the hammock or on the ground. I’ve been thinking that one of these pad holders with wings fitted to a Klymit Static V Luxe would be pretty decadent, but I don’t think such a setup exists. And of course, the V Luxe alone weighs more than some fully enclosed shelters.
My lower back and my shoulders/neck bother me pretty quickly if sleeping arrangements aren’t up to snuff. Sleeping on the diagonal, on my back, my neck and lower back are fine. Sleeping on my side, a fairly tall pillow is needed – but this is true for me in a hammock or on the ground.
If you have a good idea of what you want, check on Hammock Forums – hammocking gearheads are always turning over gear. I eventually picked up a Warbonnet Blackbird dual layer 1.1 hammock there and love it – but I weigh 50lbs more than you. You could probably get by with a single layer hammock. If you could pick up a single layer hammock with a static ridgeline and a “knotty mod” elastic at the edges and a “fronkey” bugnet, you would be at the sweet spot of what the hammock forum crowd currently considers an inexpensive, lightweight and comfortable basic setup.
And as people have pointed out, everyone is very friendly on their forums.