I am comparing the Czar to the Obsethed. I am 63 years old, 162 lbs. I ski powder in trees, groomed and some crud. Have skied only 6 years. In good shape but not the strongest dude in the world. I want to be able to ski for 3-4 hours and have versatility. Which one should I buy? Where should I mount the bindings and what length?

Check out the Liberty Helix if you can. They are similar in dimension, super light-weight with a bamboo core that is incredibly snappy and fun. So far I've skied them in deep powder, trees, groomers, dropping cornices, crud and chop, and they've been amazing at everything. They come around incredibly quickly for fat skis and are just a blast to ride. And the light weight would definitely keep you feeling strong for 4 hours at least. Plus despite the fact that critics love them, nobody seems to know about them.

Personally, I love the ObSethed a ton. YOu can use it as an everyday ripper, or your pow specific, or your A.K. only ski, doesn't matter, it handles it. I ski mostly deep pow tree lines, and I can't get over how much fun I have on it. I have demoed the Czar ski, and don't find it quite as much fun, at least for how I ski, but it does haul some pretty serious ass in the trees, I will give it that. All that said, the K2 weights way more than the Czar, so you might find that a little better for you, and might help extend that 3-4 hours. As for length I think that the 175 Czar or the 179 ObSethed would be good sizes for you, although the K2 will feel long. Bindings, anything in the trad. to +3 is a fun, floaty versatile mount point.