Mark, don't get too caught up in the "hi-rez" thing. As I've commented several times here, aside from the multi-channel aspect(if present)DVD-A/SACD doesn't necessarily have an audible advantage over CD, which has as much resolution as recordings require and human beings can hear. The quality of sound on a disc depends on the original recording technique and the mixing and mastering(or re-mixing and re-mastering for a re-release), not whether it winds up on CD, DVD-A or SACD.

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Enjoy the music, not the equipment.