See, everyones ear is different, the Yamaha may be the one for you. I wouldnt recommend getting the PC-88 for one reason though. I have heard through the grapevine that the PC-88's although they sound great, they tend to have "glass keys"(meaning they break easily).
The SP-88 was supposed to be the correction of this, too bad the piano sound is less than desirable, thats really surprising.