I recently played a Favored Soul in a one shot (12th level, using Spell Compendium Spells).
What I found is that for healing you probably want:
Heal Skill (for Healing Lorecall)
Cure Minor Wounds
Healing Lorecall (for minor conditions)
Panacea (for major conditions/poison)
Mass Lesser Vigor (out of combat healing; very point-efficient for large parties)
Heal (for quick combat recharges)
The rest of the Cure Adjective Wounds spells are pretty much redundant at that point,
but you may need them if you're lower level, of course. At Higher levels you may want to upgrade to Vigorous Circle (and later Mass Heal).
BTW, Healing Lorecall applies to the Vigor spells, too! Including the Mass ones...
(Note that I didn't take Heal for the one shot, and nearly died because of it; I thought I'd be able to get by with Mass Lesser Vigor but that didn't cut it)
You will probably want Lesser Restoration and Restoration if you're the party's only healer, too.
Planar Exchange is another truly useful spell; becoming an Avoral Guardinal was immensely useful.