For each dps spec I took #50 dps position for eight heroic 25man boss fights from World of Logs and used average dps to make this chart (ICC buff is present of course). I didn't touched top spots, since they usually include Hysteria/PI/CleavePremade, but still I wanted number which can represent current capability of class using BiS gear and top player skill. It's quite hard to rank into World Top50 and you can frequently see people from CO/vodka/Paragon there.
Every H:ICC fight is included except Gunship/Dream (only trash there, idle time), Blood Queen (highest dps classes will get first bites), LK (not enough parses for heroic fight).
For the sake of comparison I included several less optimal/pvp specs, they are shadowed.
Full table with dps numbers:
Enjoy.