Thanks for your question. We tackled it in this week's newsletter, but in case you missed it, here's the response:

Since they're designed to deliver the full range of sound to all speakers, DVD-A and SACD sound great in two-channel mode as well. Your receivers and speakers are up to snuff, so you will probably hear a difference with DVD-Audio and SACD compared to CD. We'd recommend a universal player like the Pioneer DVD-563A, which can play both formats.