Hello Hammock Forums!

I have been lurking on these forums for a while and have taken a bunch of tips and tricks from all over, but now I have a question fairly specific to my situation. My situation being that I plan to start a thruhike of the AT in mid March. Which of the many, many top quilts do I choose from?

My setup as of now is:
HH Explorer Deluxe (Because I am 6'1")
HH Hex Tarp
JRB Greylock 4 UQ with 800 Active Dry
DriDucks Poncho with UQ cover mod

I have spent several nights with this hammock setup plus a very heavy sleeping bag rated at 15 degrees. The worst I had to deal with was 28 degrees with 20-30mph winds and I was very comfortable (too warm at times).

I know I want a TQ of the down variety, but my dilemma is what to choose as far as temperature ratings and brands go. I love my Greylock 4 and have been watching the JRB Old Rag Mountain bag for a while, and I also like the looks of Underground Quilt's Flight Jacket TQ and I know there are other brands too. What temperature rating should I look for, and what brand works best for you all?