If you do fall back to a separate touchpad, I really like the borderlessness of the Ergonomic Touchpad. They have clips to mount them directly to keyboards, though that's going to obscure keys in most cases. Maybe you could get a separate numpad? Or, actually, since you're currently using the DiNovo, you're not currently using a numpad at all. It's a GlidePoint, though, and no multitouch like the Bamboo has.