Hi all, I am looking at getting the 15 inch rMBP. I wanted your opinion on whether or not I should pay $600 (here in Australia) to upgrade to the 768 gb ssd, or whether I should use that to get a synology Nas DS213+ or the DS212j with 4TB of storage? I currently have a cMBP. Has 120 gb ssd and 1tb of storage in the optibay. I have noticed that majority of the data on the 1tb is just media (movies, tv shows and photos) I keep my music on my SSD. Your opinion would be greatly appreciated.