That's a nice beginner setup but from your original post, it sounds like you're not really into the mouth-to-lung style of
vaping. I wasn't either and didn't quit smoking tobacco until I moved to direct-lung inhalation.
The NX30 can support
tanks like the Vaporesso Estoc I mentioned earlier, but that
tank really does better closer to 40 Watts. The original Crown tank
@madstabber mentioned does that very well too, as do a bunch of others.
I can't tell you what to get. I can only share what's worked for me. I have a bunch of Pico mods because they're small, powerful, portable, tough, versatile... cheap! I've very rarely seen someone here complain about the device and there are a BUNCH of Pico owners here.
The Battlestar is a two-battery mod that's also tough, powerful, versatile and just beautifully put together. That one also has a lot of users here and I have only seen one complaint and that one was on aesthetics rather than technicals or performance.