Here's my quick and dirty, (but sound), advice.
Buy an
eleaf Pico for outside the house, and a Wismec RX200 for around the house. The RX200 is ~$40, and the Pico is ~$30, (or ~$40 for the kit, which comes with a
tank and 2 EC
coils). Both devices are ergonomic, pretty well built, have a ton of features, (while still being easy to use), and have upgradable firmware. They're cheap enough that if you break one, (particularly unlikely with the RX200), replacing it is no big deal. The chip used in both appears to be the same, (and it's a great one), so transitioning from one to the other is seamless.