yeah, i think you're confused. a box mod is not NEEDED for big clouds. in fact, i can throw bigger clouds with an unregulated tube mod over a box mod... (with the right coil setup) I mean, you can throw competition sized clouds with a mech mod, a regulated tube, ANYTHING.
The NUMBER ONE RULE of ADVANCED
vaping: LEARN OHMS LAW, LEARN EVERYTHING U CAN ABOUT WATTAGE/POWER
vaping, & SUBOHM SAFETY!
You NEED to research the safety side of things before you go and chuck mad clouds, bro!!

So, do some reading in our sub-ohm / high watt forums!!
For a device, I would recommend the Evic Mini, or the Kanger Subox Mini w/ Subtank. Either Kit will give ya some great clouds, bro... CLOUDZ!
Good luck & enjoy your vape journey!