I have an old Mid 2011 Mac Mini (2,3GHz i5, 8GB) that is starting to slow down. It lags on 1080p movies in VLC and unpacking big +4GB .rar files takes a long time. I am therefor thinking of buying a new Mac Mini. I will definitely buy the top model, but I am unsure of custom options. I want to buy either the CPU (3GHz i7) or disk 512GB pcie-flash drive. My priority is lag-free 1080p movies and unpacking rar files as fast as possible. What will speed things up the most. Better disk or better CPU?