In reply to taylorct:
I'd avoid anti-shock - more weight and more to go wrong for little benefit.
I've owned and used a number of poles over the years, and I strongly recommend those with external locking, either click or external flick mechanisms. As has been said, BD do these, as do Grivel and Karrimor. These are less likely to jam, and are easier to operate when the poles and your hands are cold and wet.
A couple of weeks ago Sports Direct in Falkirk had carbon fibre poles with external locks for sale at £25 a pair - bargain!