Just as a suggestion, I have the 8MS and an Areca 1882x as well as a ATTO R680. This is what I would do were I you.
Box:
Get a proavio 6G box, not the 8ms, but the EB800ms. According to the specs this supports 6G drive speed. You want all 6G components, you’ll have a faster system, and you’ll be happier for longer.
Proavio
https://proavio.com/index.php/products/desktop/eb800ms
Talk to Jon Shilling at ProAvio.
Card:
The Areca 1882x card is good, but the ATTO R680 is better for video. I got a bad ATTO card and went with the Areca originally, but also ended up getting another ATTO which worked fine. I now have both. The ATTO is the better performer.
Drives: Everybody recommends Ultrastars but we were ok with Deskstars. Your mileage may vary.
You want 6G compatible elements for everything. You get faster speeds that way.
Good luck! The ProAvio guys will give you the proper ATTO or Areca settings needed for their box to work the best.
John Davidson | President / Creative Director | Magic Feather Inc.