I finally can support all these formats with the combination of my Rotel RSP-1098 and Denon 2900. I would like to give each of these formats a try, and was wondering what people currently consider "reference" recordings for each format? Genre is not important. I do have one HDCD which is Jewel, "Spirit" and I think that one sounds really good. I don't have any DVD-Audio discs or SACD discs, nor have I heard any in person. Thanks for your suggestions!