The hidden assumption here is that you are leaning towards physical magic.

It depends on sub-job I usually (/RDM /DNC /WAR in that order), but (outside Abyssea) I always use these:
Dual-Wield
Skillchain Bonus
Double Attack
Auto-Refresh
Magic Attack Bonus (if possible)
Accuracy Bonus (if possible)
Zanshin (if possible)