Hey guys. I'm planning on a mid march NoBo at thru in 2014 but getting all my ducks in order now so I have time to get use to it. My question is would I be better suited to get a 20* or 40* underquilt? With the 40 I could overstuff 2oz and bring it to 30* hypotheticaly. I'm pretty sure I'm going with the hammock gear incubator but have looked at the phoenix for the weight savings. Any input would be great. Thanks