dual boxing, which support secondary??

As with EQ, EQ2, SWG and WoW I've dual, tri and quad boxed in these games. Now that I've recently bought GW Prophecies, Factions, NF, I'm going with the usual combat and support class.

So as my main combat, I thought of doing Warrior/Necro
Support is definetely Monk, but I haven't decided what secondary support would be good for the combat. I thought maybe Monk/elemental would be good for extra dmg and cold snares.

Any other good suggestions for combat/support, or would these be sufficient..ty