I just got a new set of the XT/317 6 bolt with DT spokes and nipples for $100 with Avid rotors. I love them to death. Very strong and laterally stiff yet light. If you are going to pay near $200 USD you may want to look at the Mavic CrossRide. You can get them for around $200'ish and they have a 3 year crash replacement warrantee...no questions asked. You can jump off a 10 story building and completely flatten them. They are slightly heavier than the xt/317's (I think) but they're pretty nice.

Either way, I am in love with the XT/317's.