I see your point on the shaman. I enjoy the lock but I am having a hard time seeing what it brings to the team other than DPS, something my mages have in spades. Due to the macro rotations and limited keybinding/button mashing available on a multibox I doubt I would ever be able to use the Lock to its full abilities. While getting another toon up to 17 to join the team is not all that enticing (I have limited play time) I can see the advantages to having a shaman on the team.

Having never played one I will need to look into its rotation and how his DPS will match up within the mage DPS rotation. the totems in combination with a priest and a pally can really bring a lot of passive benefits to the team.

So Disc priest? I was thinking holy as she will not really be doing much DPS aside from the occasional Pain or Smite. Disc may give her some longer life though.

My goal is PVE and instances. I guess like any multi-boxer you need to make critical decisions on what to put into you 3-5 DPS macros and how they all play together. I'm also trying to 'limit' my healing buttons to 6 (flash, heal, shield, renew, ... , ... ).

For the shaman Im wondering how all the instant casting will effect my rotations and if I will need to have a few buttons reserved just for those or if I just stick with 2-3sec casts like chain lighting - which I understand is the bread and butter attack.