Follow Randall's advice, but take the first letter of each word in your sentence. You don't even have to come up with a particularly random phrase, take a song lyric. Doesn't match any common password pattern (i.e. 'someRealWord[digits]'), and it's still very easy to remember.
Your method is vastly different from Randall's method, each word there gets 11 bits of entropy because it's randomly chosen.
In properly formed English sentences, each character only has about 1 to 1.5 bits of entropy, and I'm not certain that taking the first letters of words in a sentence would have much higher per-character entropy than that, as the first letters of words are not very randomly distributed.
