Which NAS for Plex?

[StonedPenguin]

I'm looking for a NAS, Primarily for Plex. A bit confused to what will transcode if necessary without struggling on 720/1080p steams, Should be no more than 2 streams at once.

I've looked at:
WD My Cloud EX2 Ultra 2Bay,
QNAP TS-251 2 Bay,
Synology DiskStation DS216play 2-bay

Are these anygood?

 

[StonedPenguin]

Just what I needed, Thanks