G.Skill and OCZ are the best, and even TwinMOS depending on if you're talking Samsung TCCD chips or Winbond BH-5's which are TwinMOS specific.
That's why I put other. G.Skill can hit some really high FSB's with tight timings and low voltages as well as OCZ's platinum rev 2's. TwinMOS can do it with the BH-5's but require a fair amount of voltage