in the last couple of weeks I've had the the electric cooling fan replaced, the water put, thermostat, and a complete radiator flush, on my 1996 Sunfire and today my mechanic told me that my head gasket is blown. My question is how much should I expect to pay to have this repaired? I have also heard that after you have the head fixed there are still tons of problems so once I get it fixed should I sell it off or keep it? any and all advice is welcome