Many users would find a USB3 array to be fast enough. I would likely go that route instead of a TB array just based on the cost difference between the two. I

Many users would find a USB3 array to be fast enough. I would likely go that route instead of a TB array just based on the cost difference between the two. I expect that a 4k display will totally consume a TB port each. The 2x 2560x1600 displays should be chainable off a single TB port (you can do that currently). That leaves to more TB ports. Also, I expect that each TB port has its own bandwidth separate from the others, so if your TB array is the only device on the 5th or 6th port, I expect there would be no issue. There is certainly no getting around that your tower would require a separate disk box and DVD or blu-ray reader. That is unfortunate. The video card upgrade situation deeply concerns me though. The FirePros aren't entry level like the GT120s are, but they won't be top of the line 6 years from now. Further, what if I need to be running CUDA applications?