I know a lot of people knock them but we use the Brodex Hydra poles, 3 year warranty, not the lightest but for the price they are great for us and are robust as anything.
We have them in all the vans, the 18's and 25's are used day in day out. The oldest is coming up to two years, only problems that we have had is the collars have unglued themselves and we've broken a couple of clamp levers.
I've had CF poles before, but to be honest and not knocking my staff who work like trojans, they don't get looked after properly, we were lucky if we got 6 months out of a pole.
The Hydra poles are £95 for an 18' pole or £115 for the 25', come c/w brush head ready to go, works out at under £40/year for a workhorse of a pole.