There's this seemingly innocuous spell, Paragon Surge that gives you a feat you qualify for for minutes/level. It is a half elf spell, but says "ask your DM" if you are of another race and want to cast it. For the feat, you choose Improved Eldritch Heritage, choosing the 9th level blodline power from the arcane bloodline: You add a sorc/wiz spell to your spells known. This means a 11th level half elf (or human) caster can choose the best spell for the situation in every situation. That's tier 1. The spell is not on the bard's, oracle's, inquisitor's or summoner's list (the other spontaneous casters), but what are wands for if not this?

So there. From level 11, all casters can be tier 1, in my opinion.