I opted to make one of my ele shammies resto. I picked up tailoring and made her the primal mooncloth and whitemend healing sets. Your tank is in great shape, so once you get your healer some gear then you will be clearing heroics with no problems. I remember when I first started heroics. Slave Pens took me well over two hours and multiple wipes. Now that I have better gear I'm clearing it (SP) in 25 mins easy. (tankadin + 3 ele sham + 1 resto sham)