You can go carbon, fiberglass, or aluminum.
I have had bad luck with K2's fiberglass poles, as the tips blew up below the baskets. A pair of Goode poles I had worked well, but the basket system is annoying to mess with.
If you go aluminum, make sure to get some quality ones. 7075 grade is what you should get, anything less will blow up with a hard crash or two. I know Scott makes this grade, and Joystick might. Can't remember.
I'm on my second pair of Series 4 poles, and I really like them. Nice size baskets, a clean graphic, and the best strap out there.