The options are,

CHain Quest CQ

ToAI

Sandstorm set (Killing world bosses Enraged Sakun Enraged Tundro) (Needs good party/raid) (there is 2 different sets same stats though i think)

Circus Insane set

Trophy vendor set


I think that's it save for the Catacomb stuff that doesn't have a set effect

Oh and Frigid set which requires a god like good raid >.>

CQ set is untradable but TOAI you can seal/buy it from other players

Yeah. They said that it is a very hard dungeon and needs a good pt to finish.

I'm assuming you're a new 85 player? Try the set that drops from TOAI?