Am am currently using a marantz cd4000 and am planning to upgrade to Nad541i.I would like to know if the Nad is smoother and softer than the marantz.I generally like a more laid back sound.Am currently using a marantz pm7000 amp. Would my components match well. Also my music tastes are inclined to hard rock and heavy metal. I would like to know considering my taste in music would it be advisable to upgrade to highend as heavy metal recordings do not concentrate on soundstage and quality recordings.