Need some help guys. I have a Tornado and a green smoke e cig. I am not confident in bringing the Tornado out in public and the green smoke e cig is kinda crap. I am looking for something that can not turn heads in public as much. Cant decide on the 510 or the 901 or can someone recomend something else. The 510 would be handy cause then i have the chargers and the carts from the tornado but i really dont mind please all the help you can give in this matter would be appreciated. I like throat hit dont care so much about vap and battery time but i do care for quality (something that will not break or chew through atomizers) thanks all.