Upgrading to NAS, but there's so many choices

So I'm looking to offload my current setup from my main desktop onto an actual NAS, but I don't even know where to begin. I've looked at Synology, TerraMaster, QNap, Buffalo Tech, retired workstation, etc, but I don't really know what I'm looking at. I want something in the 4-8 bay range(50+Tb with 8-12tb drives) with good future expansion that meets the following criteria.

Hardware:

• Able to run Plex, Sonarr, Radarr, Prowlarr, (and misc. extra software that shall go unmentioned, but you can probably guess)
• Able to transcode at least 4 1080p streams at a time

Software:

• Easy to operate/navigate
• Reliable
• Hands off
• It just works

Of course I expect to spend hours setting everything up for the first time, but ideally it's a one time thing. Part of offloading my server is so that I'm not constantly checking up on it. Once it's setup, I want it to be out of sight, out of mine. That's why software is a big deal to me. I know Synology charges a pretty penny, but if it shows, then I really don't mind spending a little extra now to avoid unnecessary frustration down the road. Any insight you may be able to provide will be much appreciated!

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Thanks, TC370