I've ruled out the M & P just on looks alone. Sorry M & P - do love your juices though.
Phiniac - They look great, though I don't need or want an artsy-fartsy one; if I get one it would be plain pyrex. Glass appeals to my "purist" instincts; no chance of affecting the tase of the choice, and no cracking (until you drop it hard enough).
J-tank - Haven't tried them, PBusardo loves them, so I'll have to give them a shot.
(But still, they're all just plain old carto tanks. Close your eyes when you're vaping, and they're all the same).
As for "Any dual-coil: no-go", I'd like to hear more about that. If it's because they didn't give enough hit or flavor, I can see that happening at anything below about 4.25 volts/6 watts per coil. Have you ever had a PV over 3.7 volts? And just because Smoktech calls theirs "Dual Coil Tanks", that doesn't mean you have to run dual coil cartos in them. Now that I finally have a proper VV, I'm in the process of experimenting with all kinds of single and dual coils in the six DCT's that I have right now, but I very well might find that I like dual coil cartos best; they just won't be Smoktech, they'll be Boges.
Lastly, and maybe most importantly; I just might end up with the kind of tank that doesn't use cartos at all, but instead has just wicks floating in the tank to feed the atty directly. I am very sick of tasting the disgusting new filler material that Smoktech now uses in many (all?) of its new cartos, but Boge might make polyfill a non-issue.
The 510 MAP-Tank E2 Mod 2.8ohm White
And check out the "Torpedo Tank", from Vapor Age. This might just be the one:
Torpedo Tank Stainless Steel