Any suggestions for a Black Friday 5 bay NAS enclosure?

Smurfin

Looking to run unraid, and ideally want to run sabnzb/radarr/sonarr and stream UHD blurays.  My media player is a zappiti 4K HDR.

Any thoughts?  I saw the Terramaster F5-221 on amazon today for £320, but not sure if I would really need quad core to the do the above.