Hi,
I was a similar smoker, a pack a day camel menthol lights. I use a 808D from smokelessimage.com well I upgraded the batt a little but it doesn't fit in the PCC. But anyway the prices are great there and they got this nifty tech in their prefilled cartos that keeps from getting juice in your mouth and if you are a new user you will get juice in your mouth with all yess all other brands cause you won't know how to anticipate it. Anyway I still get juicy mouthed lol from time to time and I've been using the bloog cartos forever, but I switched to these and really haven't had that problem, only been a couple of cartos but bloogs were guaranteed to do it. Its a good price for the product here, and you get a PCC, which you likely won't even have to change batteries during the day with the Volt, its got an indicator as well letting you know how much charge is on the battery charging and how much the PCC has. It is the size of an I-phone, it vapes just as good as an e-go and has empty DIY cartos if you are into that(I'm lazy) the E-go is much bigger and you have to press a button to fire it, the Volt can be either manual(with the button) or auto(my fave and only, <<< again lazy guy). Not working for them as you could go with bloog, which i did originally, or go with V4L, and several others, the 510s are good but I have only tried a friends. Just my 2 cents in there, smaller is better if it performs well, and any more vapor than the 808's would be like a cigar smoke in my opinion. Either way you go happy vaping.
If you go 808 let me know if you find some cool prefilled carto sites, I'm always looking for new flavors to tantalize my tastebuds without having to work lol(<<<lazy).