Re: HDMI cable 20-25 feet long? $$
Dolby TrueHD yes, DTS-HD MA no. My Blu-Ray player does not decode DTS-HD MA internally, and my receiver doesn't decode either high-res audio format. So I decode in the player, which is fine for TrueHD but means I have to live with the 'core' for DTS-HD (which actually still sounds quite good). I have yet to run across an HD-DVD with a DTS-HD MA track.
I haven't really AB compared between high-res and standard DD/DTS audio, so I don't know that I can say how much better they are. But I can definitely say that TrueHD, and also Dolby Digital Plus and the DTS-HD 'core,' all sound very good to my ears.
Maybe someone in here who has done some comparisons could chime in?