Quote Originally Posted by Internal Error Records
Think live jam performance.
If live performance is what you have in mind than its a tie between a Korg ES-1 (or esx) and an Elektron Machinedrum.

They both offer hardcore jammability and a vast range of sounds. The ES-1 is sample based where you can load your own drum sounds (including whatever oldschool drum samples you want) and the machinedrum is a full blown synth based drum machine. Both are good instruments to play on!