I have been boxing for quite some time ... in EQ 1 .. was:

Bard,Monk,Warrior,Cleric,Enchanter,Wizard

In wow .. it was until recently just Holy Priest / Prot Paladin .. however i have since made many many many more toons across many other accounts.. and have been boxing .. priest / pali / 2 mages.. what my question is .. If you had .. pali / priest / druid .. how would you spec / box them (assuming you only wanted to box 2 of them..

Priest Heal + Druid tank
Priest Heal + Pali Tank
Pali Heal + Druid Tank
Druid Heal + Pali Tank

how would you fit those in the mix.. and what would you spec them? reasoning behind this is needed as well =)