Shimano XT Disc Brake
If your looking for new components its hard to avoid Shimano, if you have the money and worry about the weight you go for XTR but we though its would be worth testing out the XT versions to see if the cost saving is worth it.

We thought these were great until the cold weather came, then there is a bit issue. The cold seems to make them stick like the pads are not releasing we took a look at them and even tried lubeing them up but they still had the same problem. They are great in the summer crap in the winter. We are not sure yet if XTR have the same issue but se will find out.