26/32 awg ni80 round clapton wire, that's all I need, shit loads of clouds and flavour. Dual coil, 5 wraps, 3.5mm ID, 0.35ohm @ 5.30volts (15.14 amps) or 80watts approx. Nothing better for me. I = V/R, a very simple calculation to stay safe, yet it remains a mystery to loads of folks (it seems).
Single big fat coils is a different matter, I do play with those from time to time, although ramp up time can be a pita.