Hmm...sounds like we might be looking for a similar bike! To give you an idea of where I'm at - I'm an experienced rider of 29ers (er....and 26ers), and am still looking for that elusive 'do it all 29er'. I prefer natural trails to trail centres and do most of my riding on
local Dark Peak trails, with occasional trips to Scotland and Lakes.
I currently own & ride a Specialized Camber Comp 29er (also have some 26er FS and 29 HT's), and have demo'd a fair few 29ers. If you can afford it, the bike I'd strongly recommend is the SC Tallboy LTc, as to me, it felt like the perfect handling and travel balance for tough technical natural trails. I demo'd the alu version, but it felt a bit dead & disappointing compared to the carbon - FWIR, the alu frame is knocking on 7lbs!.
Personally, I've found some of the other 'trail' 29er FS's to have too long a front centre to give them the manouverability in tight techy terrain, and unless you're really on the ball and keep your weight over the front, and exaggerate the lean in turns, these long front end 29er can run wide. The most notable exception to this that I've tried was the Anthem X29 - slightly long chainstays for getting the front wheel up easily, but pretty manouverable. The only criticism I had was that I felt the suspension could do with another 20ish mm of travel for bombing fast natural descents - oh, and being super picky, I felt that the wheelbase was a little bit too biased towards the rear - if they could shift the BB back 15-20mm whilst keeping the wheelbase the same, it'd be perfect geom.
FWIW, I like the geometry of the Camber 29, and it's fantastic around trail centres like Kirroughtree and Dalby - it also cruises up natural rough climbs. However, on very fast open natural descents the suspension can feel a bit overwhelmed - have tried fatter tyres/different tyre & suspension pressures, but again, like the Anthem X29, maybe a little more travel with the same geometry would be good.
Whatever 29er full-sus you get for rough natural trail use, I'd suggest investing in the very best (stiffest & lightest) wheels that you can afford, becuase IME, once things start getting a little lairy, wheel flex can really become apparent, and can potentially be a bit of a control issue.
Anyway, I'll stop yarning on!! Basically, IMO, as it stands at the moment, the carbon Tallboy LTc is by far the best option.
Hope this lot is of some use & good luck choosing.