Khukuris are my favorite type of big knives too. I have several, but the one I use the most is a Himalayan Imports Kumar Kobra.
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It's very light for its size, but still has weight our front where you need it. I've also been pleased with how well it holds an edge.
My other favorite big knife is a Jerry Fisk designed Camillus Southwest Bowie.
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The blade is over 11" long, but the balance makes it feel weightless. It handles like a blade a quarter its size.