If you don't want mouse lag but don't want to use an unfair advantage against lower FPS players, use Dxtory to limit you to 60FPS.
It's simple, ~150 FPS players have advantage against players with lower FPS, and the players that force their FPS above 180 have an advantage against everyone.
Games such as Combat Arms and other mid level quality multiplayer games are swamped with FPS shovers that make them un-hittable when they box. It seems this is becoming more and more of a problem here in Disco as of late. Some people don't know they're doing it, others are clearly abusing it to it's maximum.