I spent all winter riding my Surly 26 x 3.8 (Larry), but after deciding to try my hand at a MTB race I figured it was time to pull out the KH 29er.
It was a little wierd at first, because a 2.4 has a whole lot less cushion than a 3.8, but after a few shorter muni rides I went and looped our local riding spot, ~10 miles of roots, rocks, hills, and mud.
What can I say, it was soooo fun and fast, and it was less work!
My Surly is nearly the same diameter as the KH29 x 2.4 (Racing Ralph), but the KH is so much lighter, and it really works well when you can keep up your speed, just floats over stuff.
I still like my Surly, but I reserve it for really hard stuff and mucky/snowy conditions or for when I’m feeling lazy 
If I had the money to build a Guni, it’d be on a 26" with an LM, that way I could run a super fat tire like the Larry 3.8, a 3" Duro or similar, or even a tire as skinny as an Intense 2.5", all on the same wheel. I suppose it’s possible to run a Larry on a KH 47mm rim, just haven’t tried it.
I was told, name witheld to protect the innocent, that a Schlumph disc hub was in the future. Personally, I’m waiting for the disc hub and who knows, maybe a three speed with reduction for climbing and tech stuff.
Terry, see if Josh will hook you up in exchange for showcasing the new Oregon. Seriously, you gotta try the Larry, it’s amazing and the tire is no heavier than an Intense 3", just a hair shorter than your Dissent 29", and it has cushion to spare.
Oh yeah, the question about crank length: I ride 170’s on all my unis (26, 29, 36) and I have a 33" inseam. Longer cranks give me the power I want for climbing and the control I like to tech stuff, spin rate is the same, so the only difference is the arc the foot moves in. I rode 165’s and when I bumped to 170’s I was “suddenly” able to climb steeper hils, so 5mm does make a difference.
For road I’d ride the shortest crank possible, as long as I could still climb okay, so maybe a 135 or even a 125.