If you aren't making your own as others have said, then may as well get the ultralight ones (carbon fiber or aluminum) = quicker reaction, easier swing, maybe a bit less fatigue over long distances.
For your mountain terrain I'd look for a good quick-adjustment for length, might be handy in steep ground (shorter for uphill, longer for downhill) -- lets you use the strap instead of adjusting the grip position.
Also, for taking pics, I've seen some with ultralight camera mounts to use the pole as a monopod.