IMHO your list is generally pretty good. There's good advice for adding items from the other forumites. In particular, I'd expand Tombstone's concern on the field jacket and Marsupial's on the clothes listed (or not listed).
For 2-5 days I'd recommend at least one more pair sox (2-3 pairs to rotate through day-to-day wear with rinsing/drying and one pair dedicated for sleeping duty). Your boot choice should work well for temps hovering around freezing point.
You don't mention if the Thermal shirt is cotton or cotton-blend. If it is, especially if it is the only layer to be worn under the M-65 plus liner, I recommend getting more synthetic fabric layers for your body. Those layers would be polypropelene type underwear tops & bottoms (US GI surplus for cheap to Patagonia Capilene for expensive) with a spare set and an warmth layer (200 or 300 weight Polarfleece for cheap to Primaloft for expensive). The watch cap for sleeping/hiking is excellent!

I'd also recommend rain pants for sure, either for rain or tromping around in the snow. Gaiters can be improvised from plastic bags. Bread loaf bags are semi-sturdy, plus two of them pack pretty small. Use paracord lashed/woven over each bag to hold it in place over your boot tops & on your leg.
Two points I'll raise question with:
- 1. gas/napalm for firestarting - Its high volatility and relatively short burn duration, plus relatively heavy weight to pack, make it a dubious choice for firestarting. If wood is dry enough to soak up the gas, it'll probably burn without the gas. If the wood doesn't soak up the gas, the gas is vaporizing off the surface of the water/ice in the wood. Careful preparation of your fire materials should preclude needing such a drastic liquid tinder for firestarting. My $0.02 would be to carry more cotton/beeswax tinder balls, some fatwood tinder sticks (Walmart has them about $4 for 30 or more 12" long sticks) among the dry wood you listed, other grease-based tinders (vaseline or antiseptic creme) on cottonballs from first aid kit, and extra fire sources (Firesteels, Blastmatch, waterproof strike-anywhere matches, Bic lighters, etc).
- 2. Regarding your statement, "a 40oz bottle of rum, gotta keep warm ya know" - The warmth that you feel when drinking alcohol is vasodilation (expanding blood vessels) allowing heat from your body's core to flow out through vessels in the extremities that the body's normal thermal regulation had previously restricted. You are only redistributing the body's warmth, not creating new warmth. As LongBow noted, drinking hot liquid does introduce new core heat. IIRC caffiene, like alcohol, can also lead to vasodilation. So non-caffienated drinks may be preferable. Please note that I do not say "Don't take the alcohol." (Been there - done that, so I'm in no position to criticize anyone's drinking choices.

) Just be aware of the body mechanics involved and compensate as best you can by dressing warm to conserve what warmth is inside you and drinking warm non-alcoholic liquids to both add core warmth to your body & stay hydrated (alcohol displaces water in your cells). Marsupials advice on fatty & salty (i.e. high caloric density) foods is on the mark. Taking extra food is usually just about enough.
FWIW here are a few reviews or discussions on primaloft jackets:
http://www.thru-hiker.com/anyboard/archive/1162.html
http://www.backpackinglight.com/index/article.asp?did=70&pid=226
http://appalachia.outdoors.org/bbs/messageview.cfm?catid=2&threadid=1371
http://www.outdoorreview.com/Techni...,Hardwear,Chugach,Pant/PRD_78216_2979crx.aspx
Have a fun trip. Sounds like you guys are gonna have a ball!