Going for an overhaul with an "overkill" objective once every three years sounds like a fantastic -- and ultimately sensible -- upgrade program to me. I imagine it takes some discipline, though. I would agree with xcylent on the GPUs. Three or four 4gb 680s sounds so sick it gives me the goosebumps! But yeah, I think you'll need some VRAM to play at the resolutions you want -- and on a multi-monitor setup at that. I'd sure love to see pics of this big, beautiful monster once it is up and running. Sounds like it's going to be one kickass rig.