Jun 4th 2009 10:04AM I can attest to the Smite priest build as I'm leveling one now. In some cases if you crit Holy Fire as well as smit you can just about two shot mobs at your own level, it's pretty powerful. I've run into a few priests playing straight shadow builds at my level (20's) and they do significantly less damage than I do.
Do yourself a favor: roll smite until the 40's. It's awesome!