I've used the Mvix (http://www.mvixusa.com/) and have been pretty happy with it, however some of the connectivity options are a little limited (eg streaming from a windows box only) but they have updated the latest model to support NAS functionality. The mvix supports a pretty wide range of formats included many varieties of HD formats (e.g. TS, mkv, etc). I've also heard that the Tvix's are pretty good (http://www.tvix.co.kr/eng/) though no first hand experience. I currently use MacMini + VLC for my HD viewing needs but its not an appliance like the mvix or tvix. Check out the AVS forums on HD media appliances, they also mention the popcorn hour as being pretty good (http://www.popcornhour.com). I'd checkout those three appliances and see what fits your needs (eg outputs, formats, etc). Just remember these sorts of appliances are all relatively new and its cutting edge technology so they're not quite as polished as dvd player you'd pickup at a best buy.