Patricia Barber redbook cd's are very well recorded...still the Sacd's take the sound to another level. Try Cafe Blue to start with. There are four P.B. sacd's put out by MFSL.
IMO, the real benefit of sacd and DVD-audio come from new recordings. The three channel Mercury catalog will be very interesting and many other recordings of years gone by also beg to be remastered...BUT, until the market is full of recordings that can take full advantage of DSD it's going to be a bumpy road.
I've listened to good TT/redbook/sacd/Dvd-audio based systems and have not been BLOWN AWAY by the difference between any of these. Multichannel may be the first of the bunch to have this effect on me, I will with hold judgement on that for now but that is the direction I am going to take..with a large grain of salt of course.
Dave