Hello people, I am going to buy me a new keyboard and by the price I am thinking about buying me a PSR 350 or if is possible a PSR 450, and also I have seen the new keyboards of casio among them the wk 3200 and 3700. but the truth I am somewhat undecided and I need a better recommendation to know exactly which of the two marks which serious the best by its functions and sound. thanks beforehand

greetings