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Well, I'm not sure if there is a list of system requirements for Rviz floating around, but I found a list of Gazebo System Requirements that gives you a broad overview of what kind of hardware would be needed for the more complex graphics proecessing.

As for your Rviz problem, I've searched around and found this page Rviz Troubleshooting that explains two possible causes to your problem. Either your card does not support OpenGL or you do not have the correct graphics drivers installed (or both). For a new laptop, I would bet that you'd be safe with most modern GPUs. If the GPU supports OpenGL, you're probably ok. You can get a laptop with a dedicated GPU for very little money nowadays.

If it helps, I can run Rviz on Intel Integrated GMA HD graphics in my laptop, but I also run it on other machines that have Nvidia 560M, Nvidia GTX 260, etc. I hope that helps. If not, I might be able to find some specific models for you.