Dungeon lvling question

[ScottBerta]

My bro and I made a new round of alts (ranger/rogue) and we wanted to lvl up in older dungeons that we had either not been to in years or ever.

So far we have hit lvl 13 and have done Blackburrow and currently in Runneye. I believe we will leave around lvl 17.

My question is what order of these zones should we go to in sequence with how challenging they will be for us?

Uguk, Cazic Thule, ToFS, Splitpaw, Lguk, Sol b and Permafrost? We plan to stay at each dungeon for around 5 or so lvls.