You should offer him $5900 for it, tell him thats just as silly as him asking $20,000 for it.
Thats what I paid for mine over 2 years ago for my 08 in and it had 19k miles on it (at the time it was KBB'd at $22,000)
"Last night I didn't get much sleep so in the morning I made my coffee with red bull instead of water, I got half way to work before I realized I forgot my car."