what's confusing? kv is the number of revolutions per volt the motor spins at.
i.e put 6 volts into a 5000kv motor and it will spin at 30,000rpm
so all the motor that have been posted have a kv rating and the higher it is the faster it will spin at a given voltage
the silver turnigy posted by the OP will take 60A so will allow for more power at 2s