I think OP is done with this thread. In another forum, he decided to buy a Pio BD player and load a hacked firmware that would play ISO.
Obviously the OP found full ISO playback with menus, etc. is necessary, but is all that really worth the extra expense? I'm happy playing an mkv of the main title on my cheap little Echoes, served by my ultra-cheap PC. I mean, if you must have the full experience, why not just play the actual disc on an actual disc player? Especially if you can't afford an expensive build, seems like a no-brainer to make a few compromises.