clif bars, trail mix (i buy the "traditional" and a heavy cranberry/raisin one, then mix) and the starkist brand flavored tuna packets & crackers.
thus far my favorite is the garlic & herb (not very garlic-y, but that's a good thing considering i've already made the cockpit smell like tuna) but the hickory is pretty good too. the entire package is only ~300 calories, so at least one meal is healthy.