As the weather turns chillier, I'm looking for some input on changes to my gear for this winter. For background, I am a fairly experienced 3 season backpacker in New England, though relatively new to winter hiking. Last year I completed the Appalachian Mountain Club's winter hiking program, as well as a few winter 4k footers in New Hampshire, and really enjoyed learning the skills to be safe when the temperatures get below freezing. I have also done a number of "freezout" trips as a Boy Scout.

I am hoping to get out this year and do a few cold weather one/two night backpacking trips. I'm thinking less than 10 miles, likely to either a shelter or cabin (Gray Knob, Doublehead, etc...). To do so, I likely need to update my sleep system. Knowing how it gets in the White Mountains, I'd like a modular system that can keep me comfortable down to -10 degrees.

What I currently own:

• Sierra Designs Cloud 20* false bottom quilt-bag hybrid (my general 3 season bag)
• REI 50* Bag (lightweight, possibly could use for layering?)
• 0* Synthetic Mummy Bag (heavy and bulky, used for Boy Scouts, needs TLC)

With these in mind, would it make more sense for me to buy a new bag, like the Marmot Wind River -10 or would I be better off with the above and one or more of the following:

• 50*/40* Enlightened Enigma Revelation Apex (Pros: synthetic insulation, available in long/wide options Cons: Most expensive option)
• Aegismax Wind Hard Quilt
• Flame's Creed 20D Quilt
  
• Therma-rest Honcho Poncho

Other options:

• Western Mountaineering VBL
• Magnet Designs Alpha Direct Bag Liner
• NatureHike Down Pants