It's a combination of things really...I'm happy enough with my PW2 and it gets plenty of use. I really, really want the page turn buttons and bigger memory which I still miss so much from the K3 and the increased resolution would be nice. However at £169 it's just out of that impulse purchase range; and for that money Amazon still won't let me use my own screensavers or do much with fonts
I might decide to order one in a few months, but right now it doesn't tempt me enough.