I recall a 2010 reference that one of the Si Targa's sold for €170,000. Currently US$150K would get you a top GT5S, but I think for an Si you are over US$200K equivalent.
One advertised for sale in France, but not sure how current the ad is;
http://www.finecars.cc/en/deta...ar/244476/index.html
Julian
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