143iloveyou is taken in all major extensions. From google:
143
Means "I Love You."
One letter in I,
Four in Love,
and three in You.
143
A numerical representation of the expression 'I love you' where each of the three numbers represents the amount of letters in each of the words.
Used by couples with pagers as a code to constantly remind one another that they still are affectionate. (More commonly used before the wide spread availability of text-messaging cell phones)
My girl sent 143 to my beeper a thousand times yesterday - she really loves me.