I would offer about 200.00 and then move on. The personalization kills the auto unless your name is Eric, you are a lawyer and you are a born again Christian and just have to have the John 4:16 stuff on it.
As a man named Fudd, and a 1/2 Jew consultant, I wouldn't give him 5$ for it.

. I'd keep waiting it out until this seller takes a reality pill and drops his price by MORE than Half. These overpriced Buy it Nows with best offer have been ruining E-bay for 2 years now. You could win that in an auction for less than 100.00 IMHO.