Update, everyone. The action on the PC88 has been replaced. What was happening at Kurzweil was that they were cranking production speeds without sufficient quality control. This led to some poor products. But about a year ago, they got it into their heads to fix things up. So they did. I just bought a PC88 and it ABSOLUTELY RULES! I wouldn't buy the Yamaha S80 because new products could have any number of things wrong with them. I strongly considered it as well, but decided against it. THe QS8 sounds to me like the sounds are lower quality than the Kurzweil. The action is also too light. And it looks cheap. And the buttons suck. The N1 has many features, but I personally hate the action. And it goes without saying that the PC88 looks the coolest by far. Whatever you choose (PC88) I hope that it serves you well for many years of intense jamming.
Any further questions? HamComet@rocketmail.com
Good luck!
-Tim Butterworth