The Treble kalimba has many musical possibilities, and has a very clear, high voice that can cut through other instruments. Get this one if you have smaller hands or superior manual dexterity.
The Treble Kalimba comes in the key of G, starting on the 3rd (B) and going up 2.5 octaves to a D. This model has been extensively copied by other manufacturers outside of Africa. The Hugh Tracey Treble Kalimba is a superior musical instrument with level tines that rarely give you problems.
Listen to these sound clips:
Treble Kalimba, Standard G
Treble Kalimba, Mid-East
Treble Kalimba, EW&F Evil
There are a lot of books and instructional downloads available to help you learn to play the Treble Kalimba.