Acacia is pretty awesome if you are in to the pre-prohibition speakeasy cocktail thing. I've gone a couple times now. I've been extremely pleased with almost all of my drinks. Everything is around $10 or so, which is fair considering most drinks have 2 shots or so of liquor.
I've only gone during happy hour during the week. At that time, the crowd has been light, a half dozen to a dozen people.
If you are looking for fancy drinks and don't mind spending money, I'd recommend this place.