Hi Sasha and welcome to Voltville. I think you'll find the Volt an easy way to convert from tobacco. As far as which kit to order, I can only relate my own experience. I initially ordered the Mega PCC and used it daily, both to caryy my spare batteries and cartos. Over time I have found that the X2 case serves me even better. I allows me to carry six 78mm batteries, a USB charging adapter, a charging cable for X2 bateries, four X2 batteries, a couple of clearomizers and half a dozen CE3s. I rarely use the Mega PCC anymore since it does not allow me to carry CE3s which have become my standard delivery system for 78mm, and sometimes X2s, as well. I would suggest getting some additional spare batteries no matter what case system you decide on, having backs for backups of your backups is always a good idea in the world of vaping.