My current NUC came from QuietPC.com - you can custom-spec them quite freely and I've been very happy with mine. Saying that, its main use is as a 24/7 torrent machine - I got the slightly taller one so it has an SSD for the OS and a 2TB 2.5" hard drive for all Jim's files. I haven't tried using one as a media centre. My media centre is a Raspberry Pi running Kodi that lives next to the TV and just streams all the videos over the network from my PC.
Still, they custom-build them for you, they come with a guarantee and you can choose the specs to your heart's content. They also do AMD ones which might be an idea as you get (admittedly basic) Radeon graphics with those, so might be better at handling the odd game than Intel's built in graphics.
EDITED: 23 Jan 2022 12:07 by DAVE!!