2008 NWZ-S739F
The NWZ-S739F is the largest capacity model in the 6th generation S series, equipped with noise-canceling functionality.
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The NWZ-A867 is the 64 GB flagship of the 2011 A Series lineup. It represented the maximum capacity with added FLAC support. It carries 64 GB storage supporting MP3, WMA, AAC, and FLAC playback plus video and photo functions. Lithium-ion battery life reached 36 hours.
The A867 is the fullest version of this generation and probably the cleanest endpoint before the A Series had to deal with much larger category changes. It still feels slim, curated, and focused. Nothing feels overstated.