Maybe this will help. I was a 3PAD smoker. I quit cold turkey. Years later got married and hubby smoked cigars. So I did too. I was smoking 5-6 a day. I started out with a convenience store $20 kit, for the novelty. 3 days later I realized I hadnt had a cigar that day. It just happened. I upgraded to a convenience store $40 kit. Then found the forum. Then a member nearby gave me a 510. Then I got Rivas(fat batts). The Rivas were the best for a few months. Then I tried a VV Buzz. Now I have 2 Buzz, a 5v GLV, and I kept 2 Rivas. ALWAYS keep USB chargeable e-cigs as backups! When you lose power, they can be re-charged from an external USB charger. The big mods that take batteries will eventually drain your battery supply. A car would have to be on for hours to charge the batteries. One 5000mAh back up will re-charge 8-10 fat bats. I have about 6 external chargers for all the phones and e-cigs. I live where power can go down for days. We do have a generator, but why have to use it to charge bats, when there is a better way. In a real bind, since all my big boys take 123a batteries, I can go out and buy the disposables at a camera store or Wally World. Not advised, but can be done. So, if your looking to save money, try out the fat bats first, they are cheap and you will want them for emergencies. Then decide on what big boy you want for a mod. Buzz or Provari would be tops in my book. Durability and function will always win over aesthetics in my world. The GLV is nice as well, mine is not regulated, and therefore is a mechanical mod. It wont suffer if its gets wet, i just pull batteries and let it dry out. It can also take a beating without breaking. Buzz and Provari have more to go wrong with them. The less features they have, the more durable they are.
Best wishes.