I think my MBP 15'' is nearly finished. I need an ultra portable device for my next laptop a I found the 13'' base model suits most of my requirements. I was going to go for the 13'' base + 16GB RAM + upgrade in procc. The only problem I have is memory. Most of my music is on icloud, etc. However, I sometimes like to boot into windows to play dolphin emulator. Is it possible I can do this via HDD or via an SD card or would it be too slow? Users with 13'' 128GB, how is storage for you?