Everyone has their own criteria. If low cost and light-weight are important and you do not need aftouch and expandability, the PSR-2000 is a good choice. If Variphrase is appealing, and vocal harmony and easy navigation are not, then the VA7 might be a good choice. If price is less important than expandability and you want vocal harmony, aftertouch (to emulate wind and stirng leads), and the ability to add user and additional factory sounds, the PA-80 is a good choice.