The 13-ounce Primus Gravity II MF ($144; primuscamping.com) is a great option. Here's why: It burns white gas, kerosene, canister gas, and petrol, so if you run low somewhere along the 120-mile trail, you'll have a better chance of finding a refill from a local. Another handy feature: The stove has a low center of gravity and boils a liter of water in three minutes, which means your pot of pasta primavera won't A) tip over and B) take forever to cook. Just don't set up camp between a musk oxen and her babies.
Go even lighter and faster with Jetboil's Personal Cooking System ($100; jetboil.com). This compact, one-pound system (which includes a one-liter "pot") will boil your ramen noodles in a half-liter of water with a click of a button in two minutes flat. Plus, it all fits into a compact Nalgene-size bottle for storage.