If speed is what you are looking for you need to look into an SSHD or an SSD. All those hard drives are slow as fukk. If you grab the SSHD just make sure you use the power of the "cloud" to have your saves stored on there in case the drive acts up.
Then again this is coming from someone who still mostly plays on the PC. Load times are unbearably slow on my PS4. If I used it more often I would have bought a 2TB SSD for it.