Personally I like a bit of a down curve in the handle, but not as much as in the khukuri pictured above. The curve helps to keep the top corner of the pommel from digging into the hand, and for me at least it makes a better feeling grip. That's apart from the question of the drop in the blade, which is another consideration.
Lokendra kami, unfortunately no longer at HI, was a master at making that kind of handle. His khukuris usually had a subtle down curve in the handle that enhanced the overall look and feel. Other kamis seem to do the same thing now and then, but not consistently.
Here's an example. Notice that the down-curve starts just after the center ring. It's much more subtle than the one pictured above, but the eye can see it, and the hand can feel it.
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The overall length of this Chitlangi is 15". I don't know the weight off hand, but probably about 18 oz.
The handle flare, which is generally more pronounced on the Chitlangis than most models, is supposed to help keep the knife from slipping out of the hand in a swing. Probably more important in wet conditions when everything is more slippery. It also looks great.
Here's an M43 by Arjun kami that also has a nicely curved handle:
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This one is 18" overall length and weighs 31 oz.