Dungeon difficulty (increasing, not ilvl):
darkhold (44) < wanderers palace (50) < brayflox (32) < stone vigil (41) < cutters cry (38) < aurum vale (47) < amdagor keep (50) < copperbell (50) < haukke (50) < pharaos (50).
If you have at least average i40 - can do lv44 and lv41 dungeons.
For the high roulette (70 myth tomes) need at least two lv50 dungeons unlocked, having WP and AK is enough. 80% of my AK runs wipe at least once, and 1/3 of copperbell runs disband due inability of finishing it (i play healer).
For main scenario roulette (300 phyl tomes) need at least two main scenario dungeons unlocked, they are so easy - half of team can be carried, so i suggest to rush them.
CT drops i80 gear, which is no use for main class - can use for alt classes.
And start trying titan hard mode in duty finder - people are not asamed to que there with like 2700 max life, and in fact 95% of wipes are caused by inability to dance, so just start learning to. For one player in my guild it took around 100 tries to finish titan.