Get a Magneto and a Kayfun. You will love it dearly. If you wanna go to an RBA I'd recommend an Infinite Tobh Clone.
The Magneto is nice because it's telescoping. You can use a tiny 18350 battery in there for stealth-mode, or you can use an 18650 if you want to use it all-day. With a .7 ohm build in your Kayfun, it'll be hitting real nice, and the battery will easily last your whole day.
I can only vouch for the V1 Magneto, and the V1 is everything you could possibly ask for. Mine has been dropped dozens of times, it's my "mag-beato" or my "beater mod". I take it camping and places where if I were to destroy it, it wouldn't be the end of the world.