If you're sold on going as a blaster, it's better to go Crossblooded Sorc Orc/Draconic for 1 level, and then go into Blood Arcanist or Admixture Wizard for the rest of your levels. Going full up as a Crossblooded Sorc is rough with the -1 spell known per spell level.
I was going to bring up going into School Savant Arcanist and taking Bloodline Development at level 6 (Arcanist 5)... but I didn't want to complicate things.