Yellowstone Super-Volcano our biggest threat?

I think that Yellowstone National Park's Caldera is the biggest threat to humanity, with the Sun at a quite point, meteors and asteroids, i have heard we know that there wont be one for 26 years or something?, the LHC not in operation, Gamma Ray Bursts not frequent enough to be dangerous, if i have missed any other please tell me, but what do you think?, i love this subject so please make it interesting.