Going rate appears to be in the $6-700 range. For local sale I'd want to be closer to $500, but the Marantz market is pretty strong so they may not go that low.
Cosmetic condition is the most important thing.
"All out of spec components replaced" is often code for "it works so I didn't actually replace anything". I can almost guarantee they didn't pull and check every single component. I'd want more details: Complete recap (if it didn't get one it will probably need one sooner rather than later)? Service bulletins performed? Were any transistors replaced (especially output or driver transistors)? If so, what substitute component was used? If a part was replaced was it's complement also replaced? Was the corresponding part in the other channel replaced?