The
device is personal preference, but the most popular devices appear to be cartos/
tanks; Vision ViVi Nova; Vision 2.0 clearomizer; and Kanger T2 (in no particular order).
As for the resistance, probably the best for the range of the twist would be somewhere between 2.4 and 2.8 ohms. That should allow you to use most of the range on your battery with different juices, but it's subjective as to the efficiency of the atomizer device.