Lots of us are using the Hacker 470kv motor. What is nice about this motor is that you could use it in both E7 and E6, therefore if you ever decide to change up your E7 to an E6 you will not need to change the motor.
What ESC are you going to use? Lots of people are using the CC ICE 120HV and lots of other guys, who are still afraid of the CC ESC, are using the Kontronik ESC. I'm using the Kontronic 80HV in both my E6 and my E7.