personally, and I don't know how warm you'lll be hanging, but I would get a warm fluffy 4 season quilt, if I could only get one. Then I would still use it and vent it for warmer use.
But I sleep cold-ish.
my hammock gear weights total: 2430g (~86oz)
Winter: total 2521 (~89oz)
(see my profile for detailed weights)
gram counter, not gram weenie!