I really don't agree with what you've just said, TEO89 isn't particulary effective and I've always felt numbers should be avoided where possible. + Your theory of how your business will be drummed up is going to provide VERY little (If any) work. (The, scrolling down, oh I remember him) thing. People go to recognised designers either way. That and if you're any sort of designer you'd keep in contact with your clients, keeping a portfolio of everyone you've worked with (And they'd keep you on their books as well.) However, some of it's true, for the love of god stay close (If not completely) to your real name. Any form of online nick just SCREAMS "forum noob", doesn't make you sound proffessional at all. It's fine for portfolio's for portfolio's sake, IE just showing your work off, but if you're really looking to drum up clients (though not impossible) you'll find it far harder with things such as TravManx.
My name is 18 chacters as well but, my user name is JRauck which I got from my first and last name Jonathan Rauck***** You could do the same... Or you could do the first inital of your first name and then put ur last name or the opposit such as JRauck***** or JonathanR or Rauck*****J