It looks pretty good, but very very situational; I don't actually see myself ever using the bonus to Spot, personally. The Foresight is nice, though.

This guy still needs a concealment remover/nullifier. Also, suggestion for called shot:

Shot to the Soul: A Sharpshooter knows how to best disrupt casters to keep them from using abilities. Someone hit with this shot may not use any spells, spell-like abilities or supernatural abilities this round. This does not negate ongoing spell effects or dispel magic in any way, it merely keeps them from using any more for one round.