Rather than buy the SmokTech 510 Dual Coil Cartomizer I would buy the SmokTech 1.5 XL Single Coil Cartomizer- tons of power and is much easier on the battery and is much larger/ can hold more juice.
I have no affiliation with DarkCity...
Kgo Starter Kit
SLB KGO Starter Kit $43.99
SmokTech 1.7 SC XL Cartos
Smok Tech XL 510 Single Coil Cartomizer - 5 Pack
$6.99 + free 5 ml juice
Coupon Code: ECFDCV is 5% off entire order.
The Starter Kit comes with a drip Tip
I would order another 5 pack of Cartomizers.
There are also Sample Packs of juice- 3 X 5 ml for only $5.00
If you're looking for a tank I use the Chopper Cyclone- no leaks and very easy to fill- $14.00 BUT the cartomizers must be punched, either by the vendor or yourself.
Understand also most of the Plastic Drip Tips do not fit tightly on the cartomizers. It's another $3.00 for a metal tip with a rubber O ring on it.