I have a S970 and a Pa4X and thought about the same question. I also have the Audya, which is a great board, but a little heavier than the Yammy, which is why I bought it. My reasoning was that the S970 is great for certain quieter jobs, and I would leave my Audya home. But now, I bought the Korg, which does it all and easy to transport. OOH, the Yamaha is different in some good ways.

Oh Hell, I guess I will keep them all, as the amount of money I would get for it isn't going to make any difference in my life.