Knowing what you need, I would go with a Riva or Ego. Their batteries last me an easy 5 hours each. I would pick up an extra charger, or a ego pass thru that you can vape with while its plugged into a computer or laptop, (if you have a comp) If you dont have the luxury of ordering things often here is what I would order:
By the way, your 510 attys will work on the ego or Riva.
1 ego or Riva kit
3 spare batteries
1 extra charger (or pass through as long as it charges the battery as its plugged in)
5 extra joye510 atomizers (or get a few low res 306 attys too)
10-20 cartomizers. You can buy these prefilled, or you can fill them yourself with a syringe, or the condom method depending on the type. I use ce2 rev 4's
150 ml of juice. Really do your homework and ask lots of questions based on what flavors you think you would enjoy
I can get about 3-4 days out of a cartomizer, or more depending on the juice. some of my juice tastes bland after 2 days though. Usually the sticky sweet ones.
A cartomizer pretty much can last me all day, about the same as a pack of smokes. I use 24 mg nic on everthing.
mostly PG, like 80% is a good amount for good thoat hit and a good amount of vapor
you can bring along a 510 also if you need something smaller, but DO NOT use an ego or Riva charger on the regular 510s.
I can use my 2 charged egos for 2 days, and then I plug them in at night. I keep 3 extra batteries on hand cause stuff happens.
Here are my favorite juices:
Atomic Cinnacide by Tasty Vapor
Peach by Vapor Bomb
Malty Toffee by Backwoods Brew
Caramel Cappacino by Kick Bass Vapor is the Bomb!!!!!
This should get you thru 3 months if you treat those attys right. I figure this is gonna run you about $250 to $300, the cost of a pack a day habit in California, half a pack in New York.