www.roku.com is the best
I have had it for 2-3 yrs now and it works great on fios / comcast, etc.
Never any buffering, problems, etc. Have it hooked up via hdmi and do get hd vids just fine.
Also, love getting new movies from Amazon, alot cheaper then dish network or cable.
They also have alot of free channels now, revision, pandora, tons others.
You can watch shows that are like the old tech tv, etc I like HD Nation and Leo laportes shows.