I ran some rough numbers from Ford's web-site, based on 2006 prices.
A Premium GT fastback costs around $28,000 with an automatic so the GT/CS package at nearly $2,000 puts the car at $30,000 before options or dealer price gouging. The convertible version is about $5,000 more so it's sitting at around $35,000.
Wow, that's a lot of money for a Mustang!!