All modern 10 speed chains are now about 5.9mm in width. They are all relatively interchangeable, but opinions will vary on which shift the best. IME, Campy chains shift the best and last longer than any other brand. A DA chain will elongate about four times faster than a Campy chain, but the overall life will be about 20-30% less. They all suffer from roller wear in addition to elongation. A DA chain will die from elongation and a Campy chain will finally die from roller wear, showing little elongation. Probably the best bang for the buck is the KMC DX10SC for $20-25 from Nashbar or Performance.