I'd say it is a steal. I got mine for 11,500 2 weeks ago with 11k more miles, no extras besides a set of off-brand 16" wheels.
Interesting intake setup he has there, non-orthodox for these cars. Looks like a FM TB Elbow w/custom bypass and a REALLY weird wastegate setup coming off of the compressor outlet bridge pipe...
I know this won't turn off most people here, but I'd bet it's seen some aggressive driving, maintenance is likely something to look at with it.
Overall, I'd buy it if I didn't just buy one!