ok I been looking at the titanium KISS but I am a little confused about the ordering options..... I don't own any W9 gear and I want to put it on a Variable Voltage device with a 510 connector... Now I know W9 is a 601 so I will need a 510 to 601 connector..... and I'll want a 3.7 volt coil but what about the other options? Vaporizer Type? Why is there a difference? Omicron, omicron lite, O-Phos, Persi?