I placed an order today for an iMac (new 2017 model), 27", i7, with the 2TB SSD. It'll replace my aging 2008 Mac Pro for my video editing workstation. On the MacPro, all my HDD storage was internal - using four large drives, two of them in a RAID 1 configuration. On the new iMac, I'm thinking I will need an external RAID for larger storage. On macsales.com I see several choices with TB2 interfaces, but nothing yet with TB3. Is it worthwhile waiting for newer products with TB3? Are any such products on the horizon? Thanks!