I'd encourage you to make your own, as your type of hikes is PERFECT for alky stoves!
But if you want to buy a Gigapower, then I urge you to buy in person at a brick/mortar store if there are any within reasonable distance. Why? Take a look at the pic below:
Looks like the stove compacts down nicely. But in reality, when compacted down, the 'closed' position of the adjustment wire valve may not align at all, but jut out anywhere from a few degrees to an annoying 45 degrees! That means you have to leave the valve at some open position in order to have it collapse down properly. And then before you screw the stove onto your fuel canister, you have to remember to FIRST shut the valve completely -- or face an annoying fuel blast when screwing the stove onto the canister!
I looked at probably 6 or 7 Gigapower stoves at REI before finding the one I now have -- where fully closed, the valve folds down nicely aligned with the stove body -- and everything compacting down properly.