i like the red-dot scopes from aimpoint. my brother has one on a silenced 10-22, that is amazing.
batteries have a five year lifespan if left on! i have been looking at sights, because you have me wanting a target .22 pistol, for chit&grins. i bet one of these would work on my compound bow!
http://www.aimpoint.com/products/aimpoint_product_lines/aimpoint_micro_t-1