I have an $800 budget and I would like to get a cpu-board-gpu-memory combo for an architecture office. The main tasks will be some 3d modeling/rendering (sketch-up, Revit and Rhino), large document production (photoshop and indesign), and Cadd work (autocad). This is going to be the workstation we use to do the harder tasks. I can give a little more money for a large jump in performance but I would like to keep the package to be under $1000. Any suggestions? Thanks in advance.