Plenty of Operating Systems to choose.

The Atom based Celeron and Pentium NUCs have a very low TDP of 10 or 15W.

Kits and Barebones come with a case and the power adapter.

The cheapest models + SO-DIMM and a storage device are available for ~€150..

It uses standardized SO-DIMMs that can be found in any laptop/mini-itx board so you are more flexible and can easily replace or upgrade it.

Almost any OS has support for the intel i9xx based GPUs.

It fully supports WOL which reduces power consumption.

Intel sells Boards(mainboard only), Kits(barebones) and Mini PC's(pre-configured barebones) under the NUC brand.

6th gen+ models have CEC support.