When picking a password, you don't just care about the entropy. You also care how far down the password guessing order it is.

People who want to guess a password don't just brute force at random. They use a guessing order that goes through more common classes of password first. So if correct horse battery staple becomes a popular password scheme, these will end up attacked before other password schemes. (See http://www.schneier.com/essay-148.html)

Unless you're going to use a password safe full of nasty passwords, you should pick your passwords using an unpopular method.