The Protank is good and uses the same coils that I linked to earlier. Those coils are interchangeable throughout the Kanger line, and can be used in the Protank 2, Mini Protank 2, Unitank, Unitank Mini, EVOD, MT3s, and T3s.
The Protank 2 uses a the single coil heads, whereas the Protank 3 uses...