For musicians that engage in sample-based live performance, Elektron has what you crave.
Presenting the Octatrack:
If you are currently using a laptop and Ableton Live for performances this could totally replace that setup. The file space is only limited by the CompactFlash card that you use with the Octatrack. This hardware unit is far more inspiring than mousing around in software as well. Step sequencer goodness…mmm.