You may want to check out http://store.acousticsounds.com/store.cfm for a very good explanation of the different types of SACD and DVD-A disks out there - as well as a very comprehensive list of which are which (so you don't accidentally buy a stereo SACD when you really wanted a multi-channel). If you really want to salivate some, check out their 'equipment' section... much of it is too expensive for me but a lot of it sure looks sweet.

ken