Well, Fenix... guess this is what you should do:
2 lines, both with bodies that are slightly thicker in material... (so the Novatac lovers don't "bash" your lights) but only different enough in thickness that you wouldn't notice it unless an older and newer were end to end. Add a couple of extra knurling rings.
line 1: Simple 2 settings, or 3 at the most, with no sos or strobe.
line 2: Several, easy to use settings for the technos. Definately a lower setting around 2lumens. A good spread of perhaps 6 settings, plus strobe and sos that can be turned on or off.
tactical switch should be an option always; very popular
Skip every other round, or even two out of three of new LED bins that come out and offer other options instead such as clips, different colours for the collectors, or optional body tubes for different types of cells. This keeps everyone just thrilled, as it gives a more diverse choice, and doesn't disappoint those who expect to see a BIG difference from one bin to the next.
And of course, as everyone knows I'm partial to by now.... A 4-CELL BODY FOR THE P3D!!!