Although pronouncing your handle may seem counterintuitive, (this is online dating after all!) it will come in handy once you start meeting people.
Peruse a couple of dating sites and you'll quickly see what I mean: "I'm the one your mother warned you about," is still a favorite after more than a decade of use, and many online daters steer clear of anyone using this tag line because of it. Try for thought-provoking, unusual and/or intriguing one-liners.
They differ in that they can be easily changed and provide a bit more space to describe whatever it is you feel relevant.