Skip the nautilus, it's not a huge upgrade over your current Kanger. But since you have the iStick 30w, get an Aspire Atlantis or Kanger Subtank Mini or joyetech Delta II or eLeaf Melo (not released yet) and some 3mg or 6mg juice, set the wattage at 25w or so, take a nice hit, and say hello to 2015.
I heard that the Delta 2 has the power of the Atlantis, flavor of the Kanger, and with the option of the RBA deck, it can be turned into a Lemo. I like the Atlantis, but I do not like the 2.5ml tank. If I see a Delta 2 in a B&M I will pick it up.
