Brian, Let me toss out some ideas…first please consider the scale investment. $30 bucks on a digital scale from walmart will be extremely usefull. Next buy the book Lighten Up…everything in the book is great except for the pictures…just kidding Mike the pics are awesome.
I think several of us are thinking the same thing which is the Jam2 is a great pack, we just need to adjust a few things for you if you want that pack to work. As Mike points out a 20 degree synthetic bag will eat up that pack.
Here are my suggestions. As I go through these consider any item you want and go to a search engine and type "item sale"..ie. "marmot hydrogen sale" results in sale price of 232 vs 309 regular price… 25% off. Look to get most stuff around 20% off. This is so you are not stuck with an item from EMS trying to save a few $.
-Pack = Jam2 (yes since you are going to trim other items)
-Shelter = tarptent Contrail or Sublite Sil or six moon designs lunar soloE or Gossamer Gear The One (~1.5 lbs)
-Sleep Bag = golite ultra quilt or Jacks-R-Better No Snivler or marmot hydrogen or western mountainering megalite or montbell UL hugger #3 (all at or under 1.5 lbs)
-Sleep Pad = gossamer gear thinlight 3/8" or ridge rest or walmart blue foam (trim it down so its under 6 oz)
-stuff sacks to hold gear separately = REI Ultralight stuffsacks (you need 2 … one for food and one for other items, pack your sleeping bag into the Jam2 without a stuff sack)
-Pack Liner = garbage bag
-Groundsheet (garbage bag) = none if using tent
-Rain Gear = Marmot Precip Jacket and Pants or Golite Virga Jacket and Reed Pants
-Base Clothes (shirt, pants, underwear) = LS synthetic T-shirt (REI MTS), lightweight convetible pants (REI sahara), synthetic underwear (exofficio worth the $)
-Thermal Underwear = none beside your base clothes already listed
-Jacket = Montbell Thermal Wrap or REI Woodland Fleece Jacket or REI Spruce Run or Mountain Hardwear compressor (im suggesting synthetic… the Montbell will save weight, but all under 16 oz)
-Socks(2 pair) = smartwool low cut (1 worn and 1 extra)
-Bandanna = 1 only
-Hat = Boonie Style, Columbia makes one I like + fleece cap
-Stove + Fuel = Alcohol (minibull designs sell many choice or get a caldera cone system)
-Pot = 550 snowpeak ti mug or Heineken 24 oz can pot
-Spork = titanium or GSL collapsible plastic
-Windguard = tin foil windscreen and foil lid for mug
-Lighter = mini bic
-Water Container(s) = 1 liter platypus and 2 liter platypus
-Water Treatment – Katadyn Micropur Tablets (no filter)
-Headlamp = 1 oz black diamond ion or just bring a photon freedom
-Firstaid = a couple of gauze pads, duct tape, 20xibuprofin, 4xBenydril, 4xImodium
-Compass + Map = color photocopy the section you will hike, a button compass works for me
-Knife = Swiss army classic (dont buy a bigger knife)
-Toothpaste/Brush = infant toothbrush and almost empty travel tube of paste (or brush with Dr Bonners soap)
-Digital Camera (considered my luxury item) = any 4-5 oz camera that is rechargeable for shorter trips (rechargeables last 3x times a set of double A's)
Items you are missing, or just not specified
– Fleece Hat (wanted to make sure you see this)
– Fleece Gloves
– DEET in mini dropper bottle
– Sunscreen in mini dropper bottle
– Camp soap in a mini dropper bottle
– Fuel Bottle – a contact solution bottle works great
– 30 feet of spectraline and plastic carabineer to bear bag
– book of matches (backup fire)
– hiking pole(s), i use only a staff but most of the shelters listed will need some pole or add lightweight ones if you dont hike with them
Please note that I am not suggesting the lightest items, but rather suggesting items that are tested and fairly durable that are also pretty easy to find and get for a fair price. The killer item is going to be the down bag, but worth every penny. If you want to save weight and bucks make the jump to tarp camping. My guess is with this list you can easily get your base weight under 10 lbs more likely 7 to 8 lbs.
Hope this helps
Jamie