I personaly use this combination
Twinhan->TSReader->Roku HD1000->Samsung DLP
IT works flawless. I can stream
PBS HD from AMC3 ku for days without any glitches.
Good thing about this setup is that your computer doesn't do much/any video processign so i t doesn't get too overloaded. If your computer is fast enough there is no reason why you couldn't connect your VGA out or
DVI out from your video card to your TV and watch it like that.