| Price depends on variables like condition and how recently serviced. Low miles ain't the be all and end all.
Doesn't seem too far away on price when you consider the sort of prices 998r have been for sale recently, either side of the one you have spotted.
As for the 996r/998r debate, that doesn't really come into it if someone has made their mind. Two Ducati's similar but different if that makes any sense!! Subtle differences in spec and heritage is what I'm trying to say.
Ray. | 
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