How much should I offer for this car...

[bmx672]

2001 Boxster
Red
30k miles
black Leather
sport package
5 speed
power seats
17" wheels
good tires
good brake pads

He want's 21,500.00 which is about right on with what KBB says for a private party sale...

The car is 10 out of 10. Original owner, all records locally etc, etc...
I can honestly say that I have never seen a Boxster in this condition.

Of course I'd get a PPI and vin check.
Assuming they come back clean... what should I offer? I don't want to insult him... but what's the typical first offer?

I would GREATLY appreciate any help guys.

Thanks.