Yea, I doubt if anyone who has been a registered member here at CPF for more than a month has just "one" light. That's because we all have different likes for how a light works and what we use it for, and we all typically get into different situations that "require" a different type of light.
My advice is to simply start with light #1, play with it, use it, form an opinion about it, and then get light #2 that fills in what light #1 is lacking.
Then when you get light #2, do the same, and so on and so on.
Hopefully, you'll end up with a nice, useable collection by the time you get to light #30 or #50 or #200 or whatever.
I'm at about 22 now, and I have to say that there aren't very many more that I feel I just "have to have". I've got all dark situations covered from EDC (120P and several single cell Surefires) to the "normal" nighttime excursions (DBS, A9, MRV... etc.), to when I want to really see something that has to be seen (running alarm calls with an AE Xenide 25W).
So you see, you can't just end up with "one" light because "dark" has so many personalities that you need many lights to light them all up. :welcome:
I can't even begin to guess where your wants and wishes are heading, but I will offer that, knowing what I know now, I would still own every light I do, but the FIRST one I would have bought would have been the 120P.
So I wouldn't have changed what I have, but I would have bought them in a different order.