Is this a crazy group makup?

[glo]

Just my $.02 paladins aren't the very best multiboxing healers. The trouble I had was no AoE heals so it I had to focus more on healing and it got to be a pain. I highly recommend a shadow priest and a boomkin (or resto druid). I am currently working towards:

Pally tank
Shadow Priest
Fire Mage
Resto Shaman
Affliction Lock

This is my 2nd group + my 10 man group. This team is currently 63, 70, 70, 59 and 69 respectively. I REALLY wish I had leveled a drood, but oh well :/

Looks fun but maybe a bit of a struggle for me to setup keybinds I would be happy with. I am looking at something like..

Prot pally or deathknight
Ele shaman
Resto shaman
Boomkin
Boomkin or mage

Until the last couple days of playing with boxing deathknights I had never considered anything other then pally for the lead, or possibly boomkin for pvp. I like the DK and wouldn't mind making that my main, so OP for sure. I'm pretty set on the two shamans simply because of the tremor totems, wrath totem is nice as well and I don't have a problem healing with the resto at all. I'm also pretty sure I want at least one boomkin for the aura and they do well sharing keybinds with the ele shaman.

The only thing I'm really debating is boomkin or mage for the final slot. I think I have already decided to do pally for pve and DK for pvp and just switch them out depending on what I am doing. You don't really get much for a pally tank from doing pvp anyway so it's really a waste, I don't know about anyone else but my pally usually just stands around in pvp anyway.

So assuming I am doing.

Prot pally for pve/DK for pvp
Ele shaman
Resto shaman
Boomkin

I've already ruled out another melee class, any suggestions? Has anyone found anything viable for boxing arena? I haven't even bothered doing an arena game just because of how lousy my shaman have done in world pvp.