What levels are you planning on playing with this character?
At level 15 an Evangelist Cleric gets access to 8th level spells, Inspire Heroics and swift action Bardic Performance, so if this is where you're finishing your character it's probably not the power-gaming option.
If you're playing to level 20 then you're not really losing much, just pushing things back a bit.
Also it depends on the boons a bit. Milani's 2nd boon is basically +1 to Inspire Courage for ine (long) combat per day. The 3rd boon will help in certain circumstances.
I understand that we will be playing till lv 19.
The 2nd boon is what my party needs, more saves. I can get it now. Or at lv 16 if I'm a pure cleric.
@zza and avr,
Thanks for pointing out prestigious spell caster. Too bad it's not PFS legal.
Anyone with advice on high level cleric spells?