For high wattage
vaping the steamcrave Hadron looks dammed tempting and interesting.
http://www.steamcrave.com/hadron220-p00080p1.html
Plus you can go and say to folks that looks like a vape mod, only smaller.
But dual 21700 will keep any high wattage user happy all day, and the yet to be released Squonk addon is an interesting idea indeed. As it's kind of 2 mods for the price of one.
And with the uncertainty over
vaping in the US, Squonking with an
rda is relatively easy to do. And you can get a lot of decent clone/copy high end RDA's for very reasonable prices. And wire and wicking is easy to source and cheap.