Re: When choosing user names for websites, I prefer to use:

[Tux]

Tux quite often is not already taken, but not available as in not allowed as being too short :( :(

[chacham]

I almost always get chacham. But, sometimes, because of a failed earlier effort i have to choose something else. Then i question, chacham1 (just add a number), chacham2 (it's the second one), or add letters before it.

Then i realize i care too much. Doesn't answer the question, but at least adds some humor.:)