Looking to upgrade...

I'm looking to upgrade from my current GT to a 03/04 Cobra. I've been looking around and there are alot of pretty decent deals out there for used ones. My question is, how many miles on the odometer should I target for possibly buying a used Cobra? Reason for asking is that these are muscle cars and they are generally driven only one way...hard. I have always bought brand new and never used because of the fear of what the person before you did to the car and how it was driven. I've spotted several with anywhere betweeen 2,000 to 10,000 miles on the odo, but what should be my limit if I was to go used?

Thanks ahead of time for all of your opinions...