I've used a gigabyte Brix n2807 - it's slightly larger than other Brix models as it takes a 2.5" drive (using an old laptop drive to save costs). It's not powerful, but it runs Kodi and Windows 10 okay. Wi-Fi and Bluetooth don't work (or didn't when I first tried) with Linux out of the box. Up to 8gb LPDDR. No power brick.
£80 on offer a couple of years ago.