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Kobold bloodline. Start as Human, 18 Cha, and start with spell focus/greater spell focus in some school you'll want to use a lot. Finally use a trait to pick up Stealth as a Class skill. Now any time from L1 on that you cast spells from that school from Stealth, under Invisibility or Improved Invisibility, if you beat your enemy's Initiative or any other time they're denied Dex bonus, the DC of your spell is DC 18 and up.
Another fun thing about the kobold bloodline; you can have multiple spell traps active at one time. With an 18 Cha at L1, if you have enough time to set them up ahead of time, you can open up a fight with 7 traps littering the battlefield, each dealing 1d8+1 points of energy damage and that energy type is determined when creating the trap.
By 9th level you have 4th level spells. The Arcane Ambush gives you a Swift action to hand out anywhere from +1 to +4 to all attack and damage to yourself and up to two allies, and those numbers will go up from there. Granted the bonuses only last 1 round but if you have to nova this is a decent boost. Downsides are that your foe or foes need to either be flanked by your allies or denied their Dex bonuses and you have to expend a spell slot to use the ability. I still think this has merit.
Of course, I've only ever built NPCs with this bloodline. Still, they ended up being very effective at their jobs; remain invisible as long as possible, using buff spells on a big boss, then melt out of the invisibility to be blaster casters, preferably staggering their attacks so that after the first one attacks the next round a second NPC appears, gaining the bloodline arcana while the first one finds some Cover and spends a round entering Stealth, only to reappear in round 3 and so on.
I should add that you'd need Racial Heritage in order to take the Kobold Bloodline as a human tho