You should check with Newtek whether the cards you mention offer any benefit when running Lightwave6. Most of the excitement surrounding consumer video cards is with respect to playing games, and has little or nothing to offer someone solely into serious 3D work. For a high end production app like Lightwave6, I suspect that any serious video boost will only come with a 'workstation' type professional graphics accelerator offering something like OpenGL support whilst running on a 'workstation' operating system like WindowsNT. Once again, Newtek will be able to give you the best advice on the type of cards that will work the best.