nooooo... don't get the scarlet crusade stuff. That is the worst possible thing a hunter can do. The stuff from scarlet monastery is based around str and stamina. Str is 100% absolutely useless, and should never be worn by a hunter unless it's in addition to AGI/AP AND Stam or Int. Leave the scarlet crusade stuff to the shamans.
That being said...
There aren't any real "sets" with set bonuses, but if you're wanting to look cool, there are green items that match each other like Bonelink, or Crusader's stuff, and that can be found on the AH in Monkey, Falcon, Agility, Of Power ect.