I tried looking on the 'which one first' thread but couldn't read the file so sorry but I'm posting a question probably asked many times. I'm buying for my daughter who is being taught at school. She's a teenager who loves musical theatre so we want to get a keyboard that will last long term to help her with her studies through college and university. So I need help with the following options (all Yamaha). Psr e443, psr ew400 or psr s670. Obviously there is a big price range there but ultimately she'd like to add a synth pad ??? To help create further compositions etc (I have no idea as I originally learnt on a three tier organ back in the 80's!!!) Any help welcome