Just a little update from this admittedly old thread. My dps numbers in mostly tier 9 for your average heroic boss now (with heroism and cooldowns):

Mage: 7-9k
Balance druid: 5k
Survival hunter: 4.5k
Paladin tank (I switched from dk and love it): 2300

Much of the reason for such high numbers is that bosses are now dead well before heroism finishes, and the mage usually still has mirror image up at the end. Mage spike damage is incredible.

Regards