First, maybe elves may have +2 Perception instead of +2 Dex. Great archer with keen senses that can stare through the soul of men. (In a system with fixed stat bonus, that is)
A race with many eyes, like some kind of spider-kin? Or eagle-folk.
Or a race of half-celestial or Inevitable created to watch over mankind or the order of the world.
A race from a word plagued with shapechangers and dopplegangers, where spotting the tell of treachery if a matter of life and death.
Just throwing some stuff, see what sticks.