You might look at the Vivi Nova V2 tanks, they have a small screw in "cartomizer/atomizer" heater coil that's closer to the cost of a carto than an atty. The guts of the unit are solid built and don't leak, and the coil (atty ??) can be replaced even without draining the tank. Definitely a fusion product, taking the best features of attys, cartos, and tanks and combining them into a "clearomizer"??.....

I tried one, and then bought 2 more, and extra replacement "attys" for them...