I EDC (on my person + in my car) both a Surefire (either a 6P or a G2, same sturdiness, a bit cheaper) and a LED light (not a Surefire but SF do have LED lights) :
- with the SF I have a small handheld projector, giving a very high intensity beam, useful in some conditions (long distance or in smoke, fog ....) ; a set of two CR123 batteries will be enough for 1 hour (with the P61 lamp assy = 65 lumens) ; I have a spare set along. And a spare bulb.
- with the LED flashlight, I have a less intense light for several hours (depends on the light I carry).

If you don't need the prefocused, hi-powered, plain and perfectly regular beam of a SF, a Streamlight Scorpion could be the answer : a powerful beam, but adjustable (by enlarging the beam, you "decrease" somewhat its intensity and you can use it to light an area near you without blinking). The Scorpion also include a spare bulb. About 1 hour on a set of two CR123 batteries.

The only problem I ever had with my SFs lights :
- bulbs are fragile (one died after using it for 10minutes and dropping the 6P from about 4 cm (less than 2 inches) !
- the rechargable batteries used in some models are not great and do not hold their supposed capacity. Anyway, rechargable models are OK only if you really use your light very often. If not, the battery will always be discharged when you will need it. For intermittent use, lithium batteries are best, IMHO.

And I guess you could choose a SF bulb model (for hi-intensity jobs) and add a LED conversion head (for long duration jobs)....