Robert McNeel & Associates does not do extensive or scientific hardware testing. We rely on reports from users (either through technical support or on the Forum) and our own hardware purchases for opinions on what equipment works best with Rhino.
So, we do not provide any kind of hardware recommendations for running Rhino, only baseline requirements or guidelines. We do recommend that you buy the most state-of-the-art computer possible when building a new system.
Ask your hardware provider what is currently the fastest available. This is a moving target. Also ask the Rhino Community through the Forum what works and what they like. Again this is always changing.
We also recommend that you buy a computer that offers a 30 day return policy. Test it with Rhino and other applications heavily during this period and return it if it does not meet your expectations.
Also see Video Card Recommendations for Rhino 5.
March 21, 2013
Here is a great list showing customer results and various system configuration benchmarks.
Hope this helps you make a really good hardware purchase!