I really like my icurve. I use a bluetooth keyboard and mouse with it when i'm using it and it works great. I know what you mean about it bouncing when you try to type on the powerbook keyboard - I do that sometimes when I'm too lazy to plug in the bluetooth adaptor. However, the main reason why I got it was so that I could use it like desktop with the screen at the right height and using an external keyboard and mouse. If you're typing on the powerbook keyboard, the screen might be in the right place, but it's going to be might uncomfortable cause you have to prop your hands up to use it and will likely need to sit closet to it.
i'd recommend a usb keyboard and mouse if you can spare it - it'll make your life a lot easier.