Ringtones

When I was in an office with just three other cell phone users, and two of whom had distinctive ringtones, I never felt the need to have anything other than the standard issue ring myself. Now, I find myself within earshot of far more cell phones and they are as unoriginal as I am. So, the time has come to wade into the murky world of finding ringtones that are distinctive enough to recognize, without being so odd that they sound unprofessional.

Suggestions, specific or process or style oriented, are welcome, for surely I am unqualified to make this decisions without advice.