Starkeeper, as you know I use the Roland A-37 controller keyboard. You can check the specs on the Roland web site. It has no voices. You can store 128 setups (program and control changes) to use with your softsynths. There are other midi controller keyboards which cost more and may be better:
http://www.studiologic.net/vmk-88.html http://www.m-audio.com/index.php?do=media.new&ID=f1d5e9fa5f5ab5ee94f61b9b262d906c http://www.viscount.it/frameset_oberheim_viscount.htm

Plus you could use any arranger keyboard or workstation as a controller keyboard.