A lot comes down to motive. Are you vaping just to vape? Or are you looking for toys, and new shiny stuff? Is this a hobby for you, or do you want to just vape and be happy?
There are tons of great mods out there in many different price ranges, and people can argue all day long as to which is best etc...
I've had my eVic, eMode, MVP2, etc...
In the house at home, I use my ProVari standard with the wider base-cap, and love it. When I go out and about, I use my Billet Box ( as I have bad hands and drop stuff).
Once you are willing to buy batteries and a decent charger, unless it's the hobby/toy/new shiny stuff - ProVari | Billet Box | REO mod - is sorta the top of the chain - again, depending on what you are trying to do.