Oh and to be honest, you should play to what you think looks the most badassery. Play what you want to play, racial abilities help. But I tend to enjoy playing what looks the coolest over what is "the best", really matters about how you play.
Worgen would be the best DPS wise, but as you don't seem to be going that hardcore I'd stay away from it as the casting animations are fucking awful.
For mucking around a lot, humans are best due to the trinket and rep bonus.
Don't do it wasting 20 of w/e your currency to play with a load of fucking retards isnt worth it
My female human mage is the best choice i've ever made. A nice looking lady comes with the nice features like reputation bonus, everyman for himself and nice spell animations.