Getting back into boxing

Hi guys, been gone a long time. I've been thoroughly enjoying my DK tank so much that I've neglected boxing altogether. I have however leveled a lot of alts. My thoughts have been going more to Cata lately, and I definitely want to level my main to the cap as quickly and as easily as possible. So I've decided to work on a healer alt to box alongside him. The real question though is which class. I have one of each class on 2 accounts now at 80. So it's pretty much pick and choose. Considering my options I'm leaning toward Druid. But at the same time, I'm thinking Shamans can heal and toss some nukes without having to change forms or anything. So, I'm on the fence.

Here's my main
http://www.wowarmory.com/character-s...scalp&cn=Khaas

My alts on the second account are just fresh 80s in quest gear, so I'm trying to pick the right one to start gearing up. Advice would be appreciated.

If you have every healer option, and want the option of DPS assistance...

A Disc priest pushes out far more dps then any other healer option.
Unless of course you go with say an Elemental Shaman who can do some healing as necessary, but is a DPS spec.

I like the idea of a Druid... go dreamstate (Balance/Resto) hybrid, which loses Wild Growth..
But your aoe heal isn't that big of a deal when you only have two toons.