The Tobh v2.5 is good, you can get a clone for under $15. Great for flavor, great for clouds.
MutationX is good for clouds for sure.
If you still want a tank and the clouds, get a Kanger Subtank. Use the rda with it.
Good box mod would be a Sigelei 150watt (Sub-$100) or IPV3 ($100). You don't really want to use an rda on an istick or anything with integrated batteries, that's a potential hazard. More so than a device you can swap out batteries.
The sigelei will fire down to .1ohms. The IPV3 upgraded does 165 watts and fires down to .08ohms.
Make sure to get some safe batteries. They both require dual 18650s. Either dual VTC4s or VTC5s.
Picture related, that's my current setup. Sigelei 150watt, Subtank Plus (Just ran out of juice though) at 30 watts, 3.1 volts with a .3ohm single coil.
Cloud/flavor for days