Archer
Honorary Master
For me the best is to get a PS3 and use a program name "ps3 media server" to stream movies over the network.
HD is not only about picture quality but also sound and the ps3 is dolby DTS, etc certified.
Also the best thing you will be able to play blu-ray movies
You can get dolby certified sound for a PC as well... And a PS3 cant play mkv files (which is usually what 720p and 1080p movies are stored as) out of the box.