I'm in search of a keyboard (new or vintage) with the following requirements: Excellent piano sound 61 Keys or less Full size keys Ability to transpose Headphone jack Built in speakers Opitional: Midi Not Required: Synth, Controller Just a little background........this keyboard will be used primarily as a practice tool for our small ensemble to help teach/keep us on pitch. I've only had Yamaha products in the past, but would consider other dependable manufacturers as well. Your thoughts and suggestions would really be appreciated. Thanks for your time and help!!!!!!!