Ask HN: What stack should I be using?

I come from a very corporate world (.Net, some Java, etc..) I want to build a fairly simple service that checks to verify if a website is up and gathers some information regarding loadtimes, etc... Nothing that hasn't been done before. My questions isn't HOW CAN this be accomplished but rather HOW SHOULD this be accomplished given the vast number of good "web stacks" out there and my rather limited experience with any of them, I am looking for advice on which route I should take?