There's light weight and then there is light weight. Skipping the really light weight folder of which I am shamefully unfamiliar, I will second, or third or otherwise echo the previous posts suggesting you get a Sebenza. As I hunter, I truly appreciate the blade shape of the Wenger, but do not like certain design aspects of the knife such as only one liner, relatively thin liner lock, clip placements, etc. (Many of these "features" lighten up the knife.) After the Sebenza, which is my first, if a bit pricey choice, I would look at the Al Mar SERE 2000 - what a rugged folder and bargain, IMO, for the price.
I assume that a multi-tool is going with you, because they are a given. A SAK should go in your pocket, just because. If sheeple and being PC is not an issue, I would go with a reasonable sized, relatively lightweight fixed blade. They are not that much larger than a folder and much better. Chris Reeve makes some nice 4" fixed blades that ride high in some really nice leather. Get one of those and a Spyderco Endura or Buck Oddysey as an "extra" knife for minimal cost.
A multi-tool, SAK and (let's say, for example) a CR Aviator would set you up for everything from making PBJ sandwiches to cutting through aluminum sheetmetal after (God forbid) a train wreck or plane crash.) You could make better choices for chopping firewood and blazing trails through the jungle, but these circimstances are highly unlikely on your trip and difficult for lightweight knives.
[This message has been edited by Nimrod (edited 01-06-2001).]