Just bought a DVD-2900. Now I need some SACDs and DVD-Audio discs. I own the Metallica DVD-Audio (Black) already. Wich discs are considered the best for reference music tests, wich ones do you (asking for personal preferences) like, and what do you recommend based on stuff you have read? Any help would be appreciated in locating some good media. Thanks. Would search but not sure what to seach on without getting 1 million hits.