Which NAS media server?

[yoyDIY]

I am looking to buy some time in near future a NAS server. I am looking at this stage at the WD My Cloud EX2 Ultra . I know making a NAS on your pc is best and cost effective, but I prefer a standalone device that is not expensive but effective for my use. I will be using it to download media stored on it to watch it  before deleting on local machine and upload new media for other family members to watch and do the same. I prefer a good speed but not the best and would like to 2 have the HDD's hot swap compatible. 

[Bottomburp]

In the last few days I just researched and chose a QNAP 431+ for my dad as the features and simplicity seemed top draw. I believe they do a 2 bay version as well.