So, found a place that will let you build a character with a gear and spec however you want and it shows the damage output of the main spells/abilities used for your class.
http://www.warcrafter.net/sandbox
There are some problems with it. It doesn't take talents into account some times (Warlock's ability "Ruin" doesn't give the 100% dmg on crit to damage outputs, just the normal 50% bonus and demonic knowledge doesn't work) but gives a *general* idea of what kind of damage you will be doing with gear sets.
On a related note: S3 warrs are just scary...nearly 40% crit rate. If you get capped for resilience it drops to a still-impressive 28+% (assuming the cap of 492).
that esactly what ive been looking for thanks capn