Thanks Jacks for the quick emails and suggestions. The sale made me pull the trigger on this a year eariler than planned.
I was going to go through this winter trying to use my double bag / double pad sleep system in my hammock; my thinking was that I would go to ground if I felt I didn't have enough insulation beneath me [snow is a great insulator between you and the cold earth]. But JRB's sale was just too tempting & I have been very happy with each purchase I have made with them.
So I bought the Hudson River as a summer UQ / 3 season TQ and the Old Rag Mountain as a 3 season UQ. I plan on supplementing the HR TQ/ORM UQ set in the winter as needed with my exisiting gear from years of tent camping.
I expect that testing the various combinations, to dial in what gear is needed based on expected overnight lows, is going to be a year long exercise and another reason to get out in the woods more often.