Possibly buying a 370z in the morning... is this a good deal?

[Astrosfan]

Hey guys,

I've been lurking on this site for quite sometime now and am tired of not having a 370z. Heres the deal...

I found a certified used 2009 base+sport with 15k miles for $28,889. I offered $26,500. What do you think is a fair price?

According to carfax the car came from OHIO, had 1 owner and never wrecked.
Also, i was considering taking it to another nissan deal to have a PPI done, is it worth it with a CPO? I basically want to see if it has been wrecked.

Another question, is a CPO supposed to come with new tires?

Just trying to get all the questions i have out there, sorry for the rambling.

Thanks in advance for the help. Hopefully by tomorrow i will be able to offically join the club.