A laptop would be really cool to have. This could be assembled like the tablet and internally be a "tier 3" tablet. It could have extra features like being able to set it down on a block in the world and interact with it as a stationary computer the same as you would while it's mobile. Plus you could make a custom model that shows the player actually holding the laptop and looking at the screen when they are interacting with the laptop.
Additionally, SSDs would be cool to have. The advantage of which could be no more component call expense for IO operations and instead just real compute time.