Cheers for the advice so far, keep it coming.
What kinda of riding do you see yourself doing with it?
Pretty much this
enjoy the ride
I don't do launching myself off drop offs. I don't like suspension hence wanting fully rigid. I prefer keeping my wheels on the ground. I'm happy out in the open or on the (not excessively technical) singletrack through the woods.
The impression that I get is that the 29er is a generaly more "relaxed" ride. Kind of tortoise and hare. Less agile than a 26" but also less "nervous" as a result. Ultimately they'll get you to the same place in the same time but just in a different way
Weight isn't going to be too much of a consideration as I want to go the Rohlof hub route which is going to make it weigh a bit more. Your comment about chainstays is interesting, how about an estay 29er (kidding).
I've seen a few fat tyred bikes and whilst I am sort of drawn to them I do think they're a bit too much for me.