I recommend you watch the videos for Newbies - see the sticky thread at the top of New Members
and these are the most popular starting lines:
Joye 510, 510 mega xl, Ego
KR808D-1 (also sold by Vapor4Life)
And I recommend manual
batteries for what ever you get. Auto batteries are more easily killed with
juice drips and autos can sometimes turn on by accident from wind or vibration. Most people here use and recommend manual batteries.
How much do you smoke, what kind of cigarettes, and what are your needs for how long one battery needs to last between charges?