I think the Surefire and the Fenix are both really great lights and you can't go wrong with either manufacturer IMHO. It's all about checking out the different models and determining what your budget and usage is going to fit.
Fenix is definately going to be getting more of my money over the coming years because they have simply impressed me with their value. That being said, I would NEVER pass over a great deal on a Surefire light because they also provide products that are outstanding.
Getting back to the OP's particular question, IMHO, 65 lumens from any source, be it LED or incandescent, is your absolute minimum when it comes to "tactical" type usage. For something that could help save your life in an encounter, always buy as much as you can afford!
