condition is the big factor, and proof of history. Its worth as much as the buyer is willing to pay. =)
I paid 11k for mine in december with similar (slightly less) mods. But it is very clean condition and 130 000km. also got last 4 yrs worth of receipts. (inc major 100k service, coils, general expected repairs, etc)
There are heaps around in the 7-11k range.