Personally, I think SACD and DVD-A are not worth the expenditure for the upgrade. I've read many reviews from audiophiles, and many think that currently, there is little to be gained by these formats. This is an interesting link on the subject.

http://www.audioholics.com/techtips/specsformats/dvd_sacd1a.php

Others believe the wheel has been reinvented. The best sound I've heard to date has come from very expensive 2 channel speakers driven with a quality amplifier and a quality CD player. Namely, Thiel or wilson speakers driven with a Levison amp at a local store.

bp