想換鋼琴 Please advise

u r using the most top JAPAN piano, Yamaha U5 is almost the same as your model, no need to change to Yamaha U5. Actually, most teacher use Kawai US-6X more than Yamaha U5. If u really want to change piano, most people will change to Europe piano after Kawai US-6X, like Seiler or Schimmel (fr Parsons)

Yamaha U5 較好