Hello, I would like to buy an a/v amplifier but I hesitate between several models. My use for this amplifier will be 80% for music and 20% for movies, so I want an excellent amplifier for music and movies. I listen many styles (hard rock, rock, classical music, word music etc.). My speakers are elestion ditton 66 but I intend to upgrade them to a have an a/v system and i will buy a dvd audio sacd player. I hesitate between the Onkyo txsr600 (449 dollars (euros) in France, marantz 5400 (600), and nad t742 (449 euros) as I can't spend more than 600 euros or dollars. Is the dts neo 6 which is present in the marantz and the onkyo important for an improvement in music. Thank you very much for your help, bye bye