We all speak from our own experiences...
I had Lowa Renegades my first trip to Africa. They did not seem heavy to me, and I think they were/are Gore-Tex.
Second trip I had GoRuck MacV-2s. Almost half the freaking weight of the Lowas - if weight is a prime consideration, I can't imagine better. Not waterproof, but frankly? If it's just an Africa thing, I can't say in my two trips that waterproof was a consideration. Maybe others who have gone more often have had a different experience?
My favorites for Alaska - when it's not Mucks or flat-out waders - are the old style Danner Jackals. Very lightweight. I like them for spring bear hunting along the coast up here. I can still find them on eBay when I decide I need a pair. Here's a picture of the old style.
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