My Celestial/Misc. healer is at level 29, and I have no clue what power to take. I even have 4 Advantage points waiting to be used, because nothing has needed ranking for the last few levels. I run in Sentinel (Support) role, and I tear things up in PvE. In PvP, I've only been killed by a team focus firing on me, or by critical Cascades/Chest Beams/Gigabolts. As far as healing, I'm satisfied with the numbers I'm putting out. Any suggestions on what to add?

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: Level 40 Champion

Superstats:
Level 5: Super Presence
Level 13: Super Constitution

Powers:
Level 1: Radiance
Level 1: Illumination -- Brilliance
Level 5: Celestial Conduit -- Rank 2, Rank 3
Level 5: Teleport -- Rank 2
Level 8: Seraphim -- Rank 2
Level 11: Force Shield -- Force Sheath, Rank 2
Level 14: Binding Of Aratron
Level 17: Masterful Dodge
Level 20: Empathic Healing
Level 23: Palliate
Level 26: Mindful Reinforcement -- Rank 2, Revitalizing Boost

Talents:
Level 1: Divinity
Level 6: Enduring
Level 9: Intimidating
Level 12: Prodigy
Level 15: Shrug It Off
Level 18: Energetic
Level 21: Boundless Reserves

Before you take other powers might I suggest changing some of the ones you already have that are either useless or not needed?

IE:

Powers:
Level 1: Radiance
Level 1: Illumination -- Brilliance
Level 5: Celestial Conduit -- Rank 2, Rank 3
Level 5: Teleport -- Rank 2
Level 8: Seraphim -- Rank 2 -Take rank three
Level 11: Force Shield -- Force Sheath, Rank 2
Level 14: Binding Of Aratron - Take Electricity one instead and slot it rank 2
Level 17: Masterful Dodge - Almost completely useless
Level 20: Empathic Healing - Completely useless if you already have celestial conduit
Level 23: Palliate
Level 26: Mindful Reinforcement -- Rank 2, Revitalizing Boost - Revitalizing boost, useless

Imbue seems like something you would be interested in. And since you're practically made for Imbue, you ought to consider getting a high damage power that can benefit from Imbue. A big heavy hitter.

This is a PVP build ... you might want to get Crippling Challenge on one of your powers.

on my healer, bcr outheals stc and conviction heals for 1200 per use. you should try those for your survival. toxic nanites is good too. DoTs let you damage while healing so those really help

You could do worse than picking up Ascension. Apart from anything else, it has a sweet animation. ^^

Similarly, Sparkstorm is a combo damage/defensive KB with an advantage that lets you turn it into a toggle. And it works while held

Like SuperChum said, Crippling Challenge will be a big boost. You only have to tap it occasionally to give teammates a real edge, and to get yourself in on more kills.