The best replacement for holy priest is disc priest.

The best alternatives to holy priest are rated as following:
★★★★★  disc priest
★★★★★  resto druid
★★★★★  holy paladin
★★★★  discipline priest
★★★  shadow priest
★★  resto shaman
★★  discipline
★  disc
★  resto druid cataclysm
  holy pally

Your alternative for holy priest is not listed? Suggest!
Speaking about holy priest, one probably shouldn't forget about mana problems.

Other search terms related to holy priest and their ratings are:
★★★★★ mana problems
★★★★ dps
★★★ mana issues
★★★ mana
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