Reactionary and Focused Mind are the first two I consider for spellcasters. Simple bonuses to rolls that are often used.
If you want to use a lot of metamagic with a specific spell, the combination of Magical Lineage and Wayang Spellhunter might be interesting.
|
Yup, those are the optimal ones.
That said, investing one in getting Diplomacy as a class skill (and there are several that do so) might also be a solid call, so you can do the full-on social thing...something that is sometimes needed in a format like PFS. Dangerously Curious is also potentially very handy.
Charming? +1 to Bluff/Diplomacy and +1 DC for language-dependent spells on anyone who is or might be sexually attracted to you.