Lots of the fancy new
rda's have single coil mode. (adjustable airflow for 1 coil)
The Magma is
excellent and is probably the easiest single coil build ever. Huge juice well, 3 air hole sizes with tasty direct under coil air flow, super condensed, domed-top chamber and no o-rings to break.
The Origen V2 is also another great option.