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I can feel your pain, brother. It's hard to find a good chopper thats doesn't double as an emergency anchor/cinder block. The blackjack looks like a pretty good design - I don't like the false-edge grind though (keep as much weight as possible on that tip! I'm not going to stab a rhino out there, I just want to chop).
If you're talking about the top pic that I posted (BJ Marauder Mk1), that's not a false edge. They actually made that one double edged. More of a combat knife than a chopper. Kinda their version of a kukri. I believe it was a copy of some Turkish design. Not sure, tho, so don't quote me on that.
I really like some of those Japanese blades, I'll be definitely checking some of those out. I may go to sunrisecustomknives.com for a custom handle, tho, I liked the big chopper you listed, but not the cord handle it comes with.
Also, have you (or anyone else) seen/tried the Extrema Ratio kukri?
http://www.extremaratioknivesdivision.eu/inglese/military/kukri.htm#
There's things I like and don't like (price is crazy, for starters; handle looks like you might send that blade flying out of your hand), but I would like to hear from anyone who's actually seen/used one. (I heard reviews that said the handle was good...)