If you have to buy poles at REI, I'd recommend the Black Diamond Trails. They don't come unlocked (slip) like my wife's Lekis. The BD flicklock system has been very reliable for me. However, if you can liquidate your REI gift card someplace, I'd go with the Gossamer Gear Lightrek 4's, which also don't slip and weigh over a pound less.

Earlylite
http://sectionhiker.com
_________________________
Earlylite
http://sectionhiker.com