Honestly longevity is nowadays not even considered. At this point its safe to push it to the bleeding edge of it's threshold and as long as you take care of the temps it will last you long after Intel comes out with their tock. If you didn't know ivy bridge is only a small leap in technology with the big one coming next after ivy bridge. So in this case I say push it as hard as you want, I've never even heard of an intel proc frying unless you are trying to set world records, and then when the next intel proc comes into production, buy it.
Also, when you install, i know this is obvious but make sure you dont bend any pins. And take caution when overclocking the ivy. It does NOT OC like sandy. read up before you push it. Anand's got a great article on it, from a few weeks ago if you really want to know how to. In my honest opinion the 2600k is still the best proc ever made.
Either way, good luck in your endeavours!