Unsure about how the new gaming GPUs perform at viewport stuff, but my K5000 Quadro did WAY better than the previous generation of gaming cards at handling large sets of geometry. Unless you plan on rendering via GPU (which most of the terrific, supported renderers are still CPU based), I'd still consider a Quadro. Unless someone can post some viewport tests saying that the new gaming cards are up to the task. The old titans weren't very suitable for workstation work (again, unless you use cuda GPU rendering)