Disc brake rotors

My rear disc rotors has been bent (Can't prove anything, but it was the bloody window fitter)...
Rotor is 160mm Shimano/icetech. Don't know the exact model and don't really know the differences between the models out there. Anyone care to advise me on a good centrelock replacement. I live and ride in Lancashire, so descents are fast and furious, but not Alpine-esque.