Can have a look at HDX X900, a Popcorn Clone with Sigma 8635 Chipset and SATA2 drive capability. http://www.hdtvplayer.info/content/view/31/28/

These NMT players are all using the same Sigma Chipset 8364/5 as well as Syabas Network Media Tank middleware. Hence the TV interface are all the same. Syabas's firmware upgrades are shared among all these companies and they get the updates at the same time. There are only slight differences between the firmwares. The major difference is the package that each manufacturer sells. Casing, output connectors etc...