I currently have just over 1tb of data. I want to get a Synology NAS to store all my media (pictures, videos, music) I also want to use the synology NAS to backup 2 macs (future iMac and current MBP) with time machine. I also currently have three 2tb drives and I could probably get two more 1 tb drives. Price is not a concern for the moment. I like the the expandability of DS1511+ and the DS712+ and they should both offer enough storage for the next few years. So my options are: Get the DS712+ and the expansion unit to have the DS712 + full and two of the 5 slots used on the expansion unit. Get the DS1511+ and put all my drives in, if ever I need more I'll get the expansion unit. Any suggestions?