only 2 choices really.
www.derhu.com is the first, long flat beach in front, rates are reasonable but don't eat here, drive into town for superb food (and DONT do the singaporean thing and say so cheap, so cheap, it wont be the next time you eat there).
slightly down the beach is the La Village resort.
http://www.impression.com.my/Ceratingmain/LVCherating/LVCherating.htmAsian Windsurfing Tour will be held in La Village in Jan.
sea is flatter infront of De Rhu, waves better in front of La village but wind is just a tiny bit more onshore.
let me know if you need more info.