Mysteel - my armory
A better number would be doing BH in Tol Barad. This has about the smallest amount of movement out of any fight in the game right now, but will give you a better estimate with raid buffs.
11k is fine to me though. Basically if you are to the point where you only need a few upgrades out of heroics, you are fine for raids. Some specs can get away with raiding earlier.
Eh let's scratch the Dps part on the dummy, (though it's good)
-Do you know the fights first and what your role is etc. (Yes I know you're a Warlock)
The simple answear is that there is no magical number which suddenly makes you good to go for raiidng. If you know the boss encoutners, know your role in those encounters, have decent gear (heroic 5man+), know your spec/class and have a afro you are ready to try out raiding, imo.
11k is fine for dummy dps. In a raid setup with buffs it translates to bout 14-15k which is plenty for normal raiding. As said before doing tactics well is what matters most
Target Dummy is single target unbuffed DPS 11k is pretty decent.