Grid is a Raid UnitFrame. Its more than decent for every healing class. Just the config is a bit tricky but not really hard.
Grids works best in combination with a ClickCasting mod(Clique/Click2Cast) and GridAlert(sound notice on custom events for example somebody gaining a debuff you can cure).
FuBar_CorkFU for buffing the raid(You need to have a Macro with "/click CorkFuFrame" and bind it to some key)
Quartz a replacement CastingBar for effectiver healing because of the Latency Bar and the Global CD Bar and displaying your Renews on the target witha Candybar.
Pitbull or other Unitframes to replace your player/Target frame and enhance it.
Its not part of Ace, but I am rather fond of Healbot.
Healbot puts a few horizontal bars with names on your screen - for yourself, party members, pets, and targets. As health goes down they go down and they change color when they hit percentages you set. Different clicks on them will cast different spells, buffs, debuffs, etc.
No need to change targeting, and no need to be in a raid to get it to work.