If you are just comming back, then you will be need to go though abyssea to get gear for quick upgrades. If that's the case, everyone uses Mnk's War's Thf's or Ninja's for tanks depending on the situation. A Mnk and a WHM can duo almost anything in abyssea. 90% of the content.
Other usefull abyssea jobs include, BLM BLU for aoe farming and yellow proccing and BST for solo reasons.
"Alot" have moved on to void watch which has better gear than abyssea, however I wouldn't reccomend going there yet. In Voidwatch pld tanks are still very important! However the gear in abyssea really helps out!
Edited, Mar 16th 2012 6:03pm by Fumikuu