I suggest you go to this site: http://www.backpacking.net/ and read the articles on the home page (listed in the left-hand column), particularly the gear lists. This info should help you pare down your weight some more. After working through those gear lists, I now can go out for a week and be quite comfortable with 25 lbs. total pack weight for 3 seasons in the Cascades. What you want to aim for is about 14-15 lbs. base weight, which is pack plus gear minus the variables of food, water and fuel. Before you make a decision on the pack, make sure it will hold all your gear plus a week’s food and fuel, and go for a long hike with full weight in it, including the extra water you’ll have to carry in the desert. If it’s still comfortable after this test, it should be a keeper even though there are lighter packs available.
The Jetboil should be able to use any canister with a Lindahl valve (all canister stoves and canisters have the same valve except Camping Gaz, despite what the different stove manufacturers say), but check to be sure. You might want to reconsider a lighter stove-pot combination, which is also a lot more versatile. My stove (Primus Micron) and pot (K-Mart grease pot) together (without the canister, whose size varies) are much lighter than the Jetboil without canister. If I want to use a frying pan or a different pot, I can, without having to adapt anything. Interestingly, per a carefully-researched article on www.thru-hiker.com, the weight advantage of alcohol stoves over canister stoves goes away for trips of a week or longer, because the alcohol stove uses more fuel.
grannyhiker