Most box mods will be fine for your needs. The teslacigs board goes down to 7 watts. It can make priming a little tricky, and I will sometimes prime coils on a different mod, but for the most part, you should be fine with that mod.
If you have worries about a particular mod, well, you can check the manufacturer's specs for lowest wattage, and what resistances it will support.
But, for the most part, if you get a large, 2 battery mod, you can put a MTL (high resistance) tank on top, and just enjoy your days and days of battery life.
I'd highly suggest going to a vape store and holding the two battery punk (with batteries in it) if you can. That mod is fantastic, but I actually wound up selling mine because I have small hands, it's heavy, and it's boxy.
If you like the mod's appeal I might consider getting the 85 watt, one battery version. Same general shape, probably about half as heavy. It should be plenty for your wattage needs, but it's just a suggestion. I found the punk to be great... Except I couldn't pick it up.
Anna