From DocRock's War Weaver guide:
Human Favored Soul 4/Church Inquisitor 1/Exalted Arcanist 1/War Weaver 5
Spellguard of Silverymoon 4/Sacred Exorcist 1/Incantatrix 4
1) Sanctum Spell, Magical Training, Precocious Apprentice (retrained to Combat Casting after 6th), Consecrate Spell
3) Purify Spell
6) Enlarge Spell
9) Extend Spell
12) Persistent Spell
15) Divine Metamagic (Persistent Spell)
17) Repeat Spell
18) Practiced Spellcaster (Favored Soul)
20) Bonus Metamagic Feat