Nah, I'm using centerlock rotors. If you're going for 140mm I can recommend the Avid HSX centerlock rotors at planet x, a tenner apiece down from RRP of £50ish. I'm running that at the back and Shimano XT 160mm rotors at the front (can't remember the model number offhand).
Ah perfect, thanks! Ordered this morning. Are using them with the 6 bolt adapter?