For light weight pants, try Wild Things. Made in the USA, and they have an outlet link on their site. The Epic Windpants are what they say they are - windpants. If you need something more breathable/durable, Railriders Weatherpants are both, but a bit heavier.
Regarding the knife, I think the pukko is a good choice. If you're cooking with a stove, there's no need for tons of firewood. You also don't need to do a ton of batoning unless you're in a particularly wet environment - if you're in the Sierras and can't start a fire with a SAK Classic, a bigger knife won't help much! However, I would definitely practice with the knife under non-critical situations, and made sure I know how to use it effectively (i.e. don't start batoning when you're 20 miles into the bush and a 3-day march from help). Consider pairing with a wire saw for cutting larger branches.
Golite packs are OK. Make sure they fit you, because the adjustment range tends to be limited. Granite Gear is also good, but a little heavier.
Polypro is OK, but wool is much better for keeping down the stink. It is pricey, but you should be able to find some for less than the cost of a good knife. Try the usual discount places (Sierra Trading Post). Ibex also has good deals on their website, and many of their items are sewn in the US.
Another helpful ultralight tip is to make a complete packing list. After your trip, check off everything you used. If you didn't use it, leave it home next time (excepting rain gear and 10 essentials/survival items). Trading a little bit of suffering for convenience can also do wonders. For example, jump out of your sleeping bag in the morning, pack up quickly, and hike to get warm, rather than throwing on a heavy jacket and huddling over the coffee pot. Note that you shouldn't confuse "convenience" with "safety" in this case.
Requisite Busse content: Why no mention of the Skeleton Key? A stripped-down Leaner Meaner would also be a beautiful camping knife. Grind down the scales or rip them off entirely and replace with cord wrap. Killer B anyone?