Hmm I'm really not fond of this healing set as using this gear really isn't too efficient. I myself play a good bit of healing rdruid in mid and this is a more appropriate set in my own opinion.
http://us.battle.net/wow/en/character/bleeding-hollow/Dimers/simple
Personally I don't think an arena season would be a good idea. This would be due to decrease in amount of people being needed to play, would cause trouble in case players want to play with a different partners, and would have to have many games scheduled consecutively to make the stream...