Not the lowest price for this outstanding NAS box, but still a great price at the moment.
And maybe add some 8tb Seagate Ironwolf too?
Details are :-
Synology DS918+ is designed for small and medium-sized businesses and IT enthusiasts. With a powerful built-in AES-NI hardware encryption engine, DS918+ provides exceptional encrypted file transmission. Also capable of transcoding up to two channels of H.265/H.264 4K videos at the same time, DS918+ is ideal for sharing and storing ultra-high definition media content.
CPU
Quad-core 1.5GHz burst up to 2.3GHz
Network
Dual 1GbE LAN ports
Memory
4GB DDR3L, scalable up to 8GB
Performance
Over 225 MB/s and 221 MB/s encrypted sequential reading and writing
DS918+ supports up to two M.2 NVMe 2280 SSDs, allowing fast system cache creation without occupying internal drive bays. Scalable up to 9 drives with a Synology Expansion Unit DX517, DS918+ answers the need for flexible storage capacity.
Thoughts on this compared to my WD PR2100? primarily used for Plex.