So what were your favorite classes for each Crystal. As a refresher, here's the list for each Crystal. Also, to make this easier, I'm sticking to the DS version.

Wind Crystal
Fighter
Black Mage
White Mage
Monk
Thief
Red Mage

Fire Crystal
Ranger
Scholar
Geomancer
Knight

Water Crystal
Dragoon
Viking
Dark Knight
Evoker
Bard

Earth Crystal
Black Belt
Devout
Magus
Summoner
Sage
Ninja