Wow, that seems expensive. Consider that you can get a new tarmac with 105 for under $2,000 and let that guide your decision. And I personally think Specialized has improved their frames quite noticeably since 2007/2008 (going off my experience moving from an '07 Roubaix to a '12 SL3 Roubaix)

7 year old carbon frame with no warranty, I'd keep it well under a grand.