WowheadPoints

This addon adds stat weight calculations to item tooltips, based on the stat weights provided by Wowhead.com. This allows you, for any given spec, to compare two items to see which one is 'better' for your character.

Currently these stats make no adjustments for reforging or sockets, so you'l need to make those comparisons yourself, although it's possibly that we can automate this in the future.