I just bought a great config for a good price. Just want to make sure I got the right model. I hate buyer's remorse. I got: 2014 rMBP 2.5 GHz, 16GB, 512GB SSD, Intel Iris The 1TB option is very expensive. I don't need the space. The 512GB should be plenty but I am concerned about the speed of the SSD. I did some research and the 1TB looks to read anywhere from 900MB/s to 1GB/s + and I think it writes at around 825 MB/s. Would I notice the speed difference going from 512GB to 1TB? Is the cost difference worth it for the speed(not the space)? I think it would be between $500 and $600 more than my config now.