I agree with both posters above. You should know what you'll use it for much more than we would. I was lucky enough to win a 16.5 inch CAK in a giveaway(the model I always wanted), and while I knew the specs, I was
not prepared for how monstrous this was. It's a bomb proof blade, I went through a block of wood a bit too much and hit the top edge on concrete. Sure, it was dulled a bit, but that was literally it. Sharpened away like nothing even happened.
That CAK is a fantastic chopper, blows through brush like it no other blade I've used. I've been able to cut through 3 inch in diameter thick walnut branch in a single chop(the first time made me smile like a madman, haha). Thats what it feels like it was designed for, heavy duty chopping. I learned that a machete is much better for the lighter stuff, 20 minutes of swinging a CAK is like an hour and half swinging a machete.
A lighter Khukuri would still be able to chop stuff like a heavy duty one, just not as well. And a heavy Khukuri could do lighter jobs, but your arm will be killing you from all the swinging. If you'll be cutting more than chopping, go light. I'm definitely going to buy myself a lighter Khukuri to go along side the biggun'. The WW2 model has been calling to me.
You know the saying, "Work smarter, not harder", that applies very well to this.
Here's one of the first pictures I took with it. First ever chop, haha.