I prefer 42/18.
42 because it is the Ultimate Answer of Life, the Universe, and Everything:
http://en.wikipedia.org/wiki/Phrases_from_The_Hitchhiker%27s...
and 18, because it is the Gematria for the word "life":
http://en.wikipedia.org/wiki/Gematria
http://en.wikipedia.org/wiki/Chai_%28symbol%29
If I'm going to adopt a system, my inner nerd insists upon increasing efficiency by using components with multiple purposes.