This one (full set) sold at Bonhams not long ago for less than $6500, including premium
http://www.bonhams.com/auctions/23508/lot/273/
When I've seen them for sale recently (= this year) they're struggling to sell above around $6600-6700, so I'd keep that in mind.
As it's a Limited Edition, it's probably best to make sure you buy the full set including warranty cards and LE certificate. While it's unlikely that you'd be up against a put-together one (like, say, a 3570.50 made to look like an Apollo XI 35th with a spare dial, handset and non-numbered caseback) it'd still affect the value quite negatively were you to re-sell it.
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