Ok, I understand that the rendering application is also an important factor for the GPU choice, but my first and main concern at this very moment is the speed/usability of sketchup itself, which is unfortunately not always very satisfying at the moment.
For the rendering application I haven't made a choice yet, because the prices vary from completely free to several thousands of dollars (while each rendering application has its pros and cons of course).
Currently I am using both Kerkythea and Maxwell render free, but I am also considering Thea render, Maxwell (licensed pluginn because studio is too expensive at the moment), Artlantis Render, IRender nXt and Indigo Render.
Are there already any details available about sketchup 9 ? Will it benefit from CUDA cores ?