Listen to Ekona mate, when the Vantage came out there were huge issues with them. To the extent AM had to totally strip one to bare bones to try and find a fix. One of our customers purchased 2 Vanquish's and a DBS instead Go for a DB9 or a Vanquish for a little extra cash
Porsche 997's are also coming down in price as are early GT-R's.
You might get a good one but speak to Zedrush about his experience of owning one first if your serious about the purchase