Crystal tower is a sidequest, it's in Mor Dhona southeast. Labyrinth of the Ancients is the first of the three, followed by Syrcus Tower then World of Darkness, that should get you decently geared.
Before you go there, I'd take a full day or two and do hunts, that should get you enough soldiery to get you a full set for 1 job.. then upgrade with WoD gear, you should be well on your way to i120.