+1 for the BD Expedition poles. Flick lock three section poles are the only system to go with. Makes sure after your day to open up the poles all the way so that they dry out. Or take them fully apart. Otherwise they get jammed up and hard to use. That is the only thing you want to keep in mind with them.
I have about 400 miles on my black diamond collapsible poles with the flick lock system, love em and they should double as trekking poles for backpacking.