Some really good wine and chocolate!  Can't live without those!

many of those options on the list are relative disasters and others highly unlikely to near impossible. The LHC simply is not going to produce catastrophic black holes, and while a "nuclear accident", i.e meltdown, would be pretty horrible it nowhere near comes to destroying the world. Next step up, events that knock out our power supply would cause quite a lot of problems and society as we know it would change dramatically, including pretty heavy die-backs, especially in heavily industrialized countries, but, again, not the end of the world. Even events such as global warming or an ice-age don't meet that criteria. You want possible, truly world destroying events, asteroid collision, full scale nuclear war, something that affects the entire earth all at once with extremely high initial mortality rates with multi-year/decade lingering after effects.

Asteroid strike most likely, most deadly.

2012 = The discovery of "time travel".

The "end of the Mayan calendar" is simply the end of our current perception of time.  Through our own haphazard luck, or through "visitation", we will poke through our limited perception, and will have created a "new" perceptual calendar. We will begin to understand that "time" is not a linear "process" at all. Thus, the end of one "world" and the beginning of a new one.

Just a thought.

I think it will be the professor in the kitchen with the candlestick.   (There's a really deep metaphor in there.  Let me know when you figure it out so that I can say it was intentional.)

I'm not taking anything with me.  I need a fresh start.