be careful comparing the cd layer of an SACD hybrid disc to the SACD layer. i have found that a 'pure' redbook CD often outplays 'redbook' playback on hybrid SACD's? if this is done with marketing purposes in mind, or just 'sloppy' mastering as seeing the SACD layer to be the method of choice on these discs, i cannot answer, but i've found it interesting comparing redbook CD's to the redbook layer on SACD of the same title. as for must own SACD titles, i would add:
michel camilo's live at the blue note
michel camilo's live at the blue note