DH and I both have Black Diamonds that we picked up from REI last year. I can't remember the models--Trail Shock maybe. I love them, especially on steep terrain or rocky/wet terrain. They've saved my skin a number of times and generally helped me hike over longer distances without as much fatigue.
A few of the features that I recall looking at are shock absorbtion. Mine have it; DH's don't. I like mine better, and I think he wishes that he'd gone that route too. Another feature are the grips themselves. At the time we ordered them, I tried both the compact and non-compact versions. I preferred the former. The locking mechanisms (how you extend or shorten) the poles is also a feature to look for. How easy are they adjust on the fly? Do they stay secure? We've had no problems with ours, and they're easy enough to use. Finally, the weight and hand straps are also something to keep in mind.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher