I was fortunate enough to find the M2 for $89 at botach tactical. That was in April of this year, so I don't know if that deal still stands. For that price, I couldn't say no! I have the 6P as well, and for daily carry, that was more than sufficient. Many of my mini mags have gone to flashlight heaven, but my original Surefire 6P looks brand new, and has only had 1 bulb go bad in about 2-3 years. Thus, I think that just about any Surefire will be more than what the average guy needs, but the M2's design, chunky overengineering, heavy hex bezel, belt clip, awesome pyrex lens and unusual anodizing make it an attractive package indeed. It's definitely a unique flashlight, and you get real tactile satisfaction from using it.
Jefroman is right about burntime, of course. I tend to use my Surefires sparingly. Get yourself a couple of photons (or my current fave, a Petzl Tikka headlamp) for those run-of-the mill flashlight chores, and save the Surefire for the big jobs.
Short answer: IMHO, Get it if you can afford it. The extra engineering makes for a flashlight that is more pleasing, but you are unlikely to need all that extra stuff for normal use.
-Jeeves