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I actually got a really good deal, won a hit '04 rx8 on auction for 3500, repaired it and it came out to be about $7000 total. It has Grand touring package with ever option available, including GPS. Also got Lambo doors, Greddy exhaust, Tein springs and more.
Are you on redwingscentral?
To answer the original question, probably about $2,000 not counting consumables like tires and brake pads.