I have a full PMC set, Crown of the Sea witch, Cloak of Scintillating Auras, Bands of the Benevolent, Handwraps of flowing thought, pants of the naaru, shattrath jumpers, couple of epic rings and some green :( trinkets. Weapon is currently epoch-mender with the +81 heals and =30 heals on wrists too. Some upgrades needed, so thanks for the advice!
Well, the healing gear you have is fairly decent, but part of the reason your healing is so low is simply because a lot of it is damage gear. You can get a fairly large upgrade for your gloves by getting the badge gloves, particularly since you're wearing damage ones. The badge gloves are better than tier 5, so they're worth every badge. For a good upgrade for your hat, you can get the Whitemend one made, and it'll last you for quite a while, particularly if you pair it with the pants.
Since you're using green trinkets, I would also very much advise spending 41 Badges on the healing trinket, it will last you a long time. Your other trinket would either be the Ribbon from the Opera event in Karazhan, or you'd have to wait until you can down Lurker or Gruul for another reasonable priest trinket. If you want to find a decent Blue trinket, Scarab of the Infinite Cycle, the Lower City Prayer Book, or the Bangle of Endless Blessings all make nice trinkets as well.