Well Pete, since you asked...
Personally, I'm of the opinion, that for chopping work, anything larger than the 22.5" (old school) Ganga Ram Special, would be fruitless. Mine, at 54oz (with non chiruwa-tang) would be unwieldable if it were heavier IMHO, and honestly, I can't imagine a job that would require anything choppier.
So I think that only leaves a large Sirupate, Kumar Kobra, or maybe a huge Chitlangi, obviously, the application of these longer blade is martial. Personally, I favor the Kobras, since they were designed for that size. Of course, nobody better to make a Kumar Kobra, than Kumar himself. Alas, he's no longer making khuk for HI, so I dunno of the current working Kamis.. Honestly, I'm not sure who the current working Kami's are, other than Rajkumar, Bhakta, and Tirtha. Of those, I'd guess Tirtha is most suitable to make a long but agile khuk, but that's just an assumption.
What do the rest of you guys think?