Windows System Configuration Advice

New to Windows and wanting to configure a desktop for Rhino/Grasshopper . . . A system for developing forms that are likely toward the low end of capability. For a new Rhino user on new platform, any stability issues to be considered between Windows 7 or 8?

On the Rhino site I find the note; "Rhino V5 requires OpenGL version 2.0 and Shader version 1.2"
AMD offers FirePro™ V5900, OpenGL®: 4.1 and Shader Model: 5.0. I should assume this is not a compatibility problem?

Also, any guidance on CPU brand and display brand welcome!