If you are looking for something cig sized, I can't recommend the eRoll enough. It's smaller than a 510, but works like an ego. It uses an unregulated battery for great power, and a ego c atomizer. Check out the eRoll thread. The PCC is good for 10+ hours.
http://www.e-cigarette-forum.com/forum/general-e-smoking-discussion/340059-joyetech-eroll.html
I think this is probably the best starter setup, particularly for under a PAD smoker.
It really is convenient, similar size and experience to smoking.
I think recommendations for a big mod or even ego batteries are less likely to be successful.
What makes the eroll more likely to succeed is that it is much more pocket friendly then these other devices. He only smokes 1/2 to 1/3 pack a day? Why would he want to carry around these devices all day? The eroll is perfect for him.
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