I am assuming we are talking about the early 6rd with notched grip 1997-99. The 7rd mag would be for the late 4553TSW with full length grip and Loaded Chamber Indicator port and probably with rail (2000-2002). Both pretty rare birds - I've only seen 1 each, but as pointed out the DAO is generally less popular than the 4513TSW TDA configuration to shooters. Hence the short manufacture dates, small quantities, and potential collectibility - though some would argue 3rd gen pistols are "not collectible".
The 6rd no rail configuration would be more concealable and extra SW mags would be a plus to a shooter but the immaculate condition would not be a big deal - once you start carrying / shooting it, that would go away. And The DAO could go either way depending on preference.
Probably your best $ market would be to a collector looking to fill a hole in a collection with an immaculate example particularly if you have original box and at least 3 factory mags - but you have to find that collector.
You might put it in classifieds below (better than GB - no commissions but you could get lucky and find competing lunatics on GB)
If you go classifieds, I would list with good pictures with 3 mags at $650 and offer to include the extra mags for $40 ea to sweeten the deal - thats probably tops - be prepared to negotiate.
If buyer is ok with the 3, list mags separately for $50 ea - they will go fast.
