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I've always been happy with full rigid and cantilevers, but I'm kind of a slow retrogrouch. That said, I am on the look-out for a particular old frame that is a front suspension bike for my next off road MTB. Discs are over rated though, and unless you are experienced and aggressive you don't need full squish, front suspension is plenty. My lady and I only get a chance to get our mountain bikes out of the city a 2-3 times of year, so we're perpetually in "getting the rust off our old skills" phase, so mostly we've been riding Banner and Capitol Forest as they are pretty mellow. Lots of options around here to ride though.

Edit: 26 vs 29: I prefer 26", when I rode a 29er it felt like I was perched too high up, I felt like I was not well balanced in comparison to when I mountain bike on a 26 inch wheeled bike. You might have a hard time finding a new 26 inch wheeled bike though.