I have the same mod/tank, and between the Nickel and Titanium, I found the Titanium to have a more metallic taste for me. I went and got Vaporesso ceramic coils that fits this tank and enjoyed them just fine.. but I started to rebuild them, as they are very easy to take apart and refit them with a new coil/cotton. I just use 16 turns with 28 gauge with organic Japanese cotton and the rebuilds work as good if not better (and gives me 0.2 Ohm).