Many people are not looking for anything in specific - they will go for a particular kalimba or tuning because it makes cool music that resonates with them. I think chances are good that these people will find something that tickles them among the tunings I have presented.
Some people have very specific needs. They might require a sansula in a particular key so that it will work with other instruments playing a song in that key, or to accompany singing a particular song in that key. Inventing a tuning for a particular key is as much an art as a science.
In many cases, we can come up with a kalimba that fits your needs. This service is part of what we do at Kalimba Magic. Let us know if you have the need for a special tuning.