I'm glad I'm not the only one in this situation! Well, as I said before, I can't box three DPS classes because my friend intends to box a healer and a DPS/hybrid character, so I'm stuck tanking one way or another, which is why I thought a backup healer/hybrid character would be beneficial.

I really like the shadow priest idea, and I'm also considering an elemental shaman. For my third character, I'm either using a warlock or a mage (I enjoy a warlock more, but I've played several at this point).

I'm actually rolling these characters on Monday, so I'll let everyone know what I end up choosing at that point. In the mean time, if anyone has any more suggestions, they're always welcomed. =)