I backpack with a base weight of about 16 lb. for summer and early fall trips on the Appalachian Trail. I use the Granite Gear Vapor Trail pack which weighs 2 lb. My sleeping bag is a Montbell down bag that weight 23 oz and compresses quite small. I use a 10 oz torso-sized inflatable pad from backpackinglight.com, that provides reasonable comfort and takes up very little pack space. You can put your pack under your legs for additional insulation. This site has some lightweight closed-cell foam pads. Also, consider chemicals rather than a filter if you have a fairly clean source of moving water. Aquamira is very good or the new chlorine dioxide tablets. For a stove, try a homemade or commercial alcohol stove - they weigh about 0.5 oz and have no moving parts to break. Combined with a titanium pot of ~0.9 liter and a cozy (insulation for the pot), you get a cook kit that weighs only 1 lb including cup and spoon/spork. You minimize fuel use by bringing things to a boil and letting them sit in the cozy to cook.I tend to carry a hammock and tarp, or just a tarp if shelters are available. If you prefer a tent, there are some excellent single-walled lightweight tents available such as these. You've got the right idea on clothing, but I'd reduce the number of socks you carry. Plan to get 2 days per pair or wash them while you're out. If you sew, you can make yourself rainpants from silnylon that weigh only 3 oz.

Good luck and have a great trip.