[kohokoho]

So finally, I took my 88 Camry (164K) to a certified repair shop after the temp gage showed HOT (occasionally touching the red mark) throughout a 15 min long drive. The shop did a PS1 (pressure ?) test in the cooling system and told me that the head gasket was blown. The radiator has some fins missing too. There was no apparent external coolant leak. They told me I had two options:
1. Replace the head gasket and check for cracks in the cylinder which would cost around $1500. They were also not sure if the if it would be a good idea to replace the gasket at this many miles.

2. Replace the motor (engine);cost around $1200-1500, with labor.

Now I am having a hard time making a decision on what to do. I would definitley want to be certain that those are my only two options before letting the car go. I had bought this car at 158K for $850 and have been enjoying driving it, specially after the $180 tune-up yesterday which has made the car run literally like new (amazing smoothness !) At this point, I am just praying that it's not the gasket. This is the only car I have and my only means of getting to and from work. I would like to hear from you all what your opinions are on other possible causes of overheating. What are some symptoms of blown head gasket? Is replacing the gasket really worth that much ? Could it just be the radiator? Do I have other options? I am frustrated...Please help !