Hi, Plex is great but be aware with Plex that it can not play all media formats. If you have a massive library as I do it was a no go for me as I have a ton of DVD's and Blu-rays rip to ISO and BDMV and I'm not will to spend the time and processing power to convert to MKV. I use Kodi with Librelec and CoreElec to stream from my NAS. For players I have a few Odriod C2 that have been the most solid of the bunch and will do 4k but no HDR. If I was buying new Players I would go with Odriod N2 4K and HDR. They have a CoreElec model that comes loaded with Kodi. I recommend checking them out here. Alan's Kodi Driver is awesome!