take a test ride on a 29" before going that route. loved the speed on the flats and rolling power over minor obstacles, but i do more technical riding and it just wasn't cutting it.
i stuck with a 26" kona nunu... inexpensive and did all i want. i had gone the kijiji route for my last two and thought i was just extra hard on them as i was breaking stuff left and right. i think buying used for a mtn bike can be like shopping for a used track car... buyer beware. the nunu has had zero issues. only things i changed were the saddle tires and chain. the rest has been solid from the get go.
a few riding buddies of mine use those trails a lot and find the 29's do the job... so if that's where you are riding 90+% of the time... maybe worthwhile. i like to head up to kelso and hilton falls where the rocks and trees just got in the way for the bigguns.
overall, i've had giant, gary fisher, specialized, rocky mountain, norco and konas.... for hardtails, the rocky mountain and kona have had my favourite frame geometry.