Stand-alone NAS as a Plex server PMS

I have no idea what I need to build a solid NAS set up that suits my needs. My current set up is as follows:

2017 MBP 3.1 GHz Intel Core i7 16GB DDR3 Radeon Pro 560 4096 MB Intel HD Graphics 630 1536 MB

The above is what runs my PMS.

My actual content is stored on a 4TB Seagate external drive (almost full) attached to a Netgear Nighthawk R7000.

I have a gigabit internet connection.

I would like to stop using my MBP as the server and move to a stand-alone NAS unit. 4k support would be nice but not required, I think my biggest concern is potential transcoding and catering to multiple users inside and outside the home. 2 to 3 simultaneously with 8-10 total. It’s rare more than 3 users are accessing the system at once, but I’d like to be prepared for it.

I was looking at a Synology DS918+ Upgraded to 16GB Ram and a Samsung 970 EVO 250GB – NVMe PCIe M.2 2280 SSD.

Undecided on the drives to be used or really how to proceed in general.

Any help or advice would be appreciated, I’m just afraid of buying on name or going full overkill.

Budget is flexible. I think I built one set up that was like $1500 at one point, lower is better of course, but I’m willing to pay more for quality and power.

If you hade 4K media to transcode then DS918+ would not be enough and you would need to look at TVS-872XT or TVS-1282. But transcoding 3 Full HD streams will not be a difficult task for DS918+. If you can still source a DS916+, you might even get that. It is an older model, but it has a much faster processor. Which is very handy for transcoding.

Nvme will not improve the transcoding performance. But SSD will definitely make user interface feel much faster and metadata will be generated and accessed much quicker. But SSD will also cost more.

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