1998 BMW 740iL - Blown head gasket on 1998 BMW 740iL

My 1998 BMW 740iL - 117500 miles - apparently has blown head gaskets. Estimates range from $2300. to $4000., provided, there is nothing else wrong. I'm looking for an input about having it repaired or not. I'm afraid of the possibility of a never ending repairs.

Asked by for the 1998 BMW 740iL