I'm a prosumer interested in getting the nMP for editing mostly 1080p. I currently have a 4,1 mac pro (hex 3.46) but like the smaller form factor and lower energy requirements of the shiny new model. I currently have 1 internal SSD for the OS, 1 SATA 7200 HDD for user data, 1 SATA 7200 HDD for scratch and a couple of drives that archive old projects so aren't being used much. What would be the best value external option for the user data drive and scratch drive? TB2 seems a bit overkill - I wonder how well USB3 would work compared to the current internal SATA setup. I also wonder if there'd be any performance gains in using a SSD for either scratch, user data or both? With a HE discount I estimate the cost to me of getting the base nMP after selling the oMP will be around £800.