I would buy it.

Certainly try and negotiate because it wouldn't hurt. You have nothing to lose.

The full price is certainly a fair price anyway. You will likely never find another E320 with that low mileage and a new head gasket.

The head gasket repair alone is about a $1,500 job.

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".