Take it to a paint correction detailer. Acid rain spots should buff out of the clearcoat with a good etching polish and a high speed orbital. As for your new scratches, it sounds like that paint work is inevitable.
I would sell the car and buy a new 987 before putting that kind of money into a 2004 986. You will be easily be in 987 price range if you put that paint money towards the new car.
I have a classic truck that I was pricing paint for last year and was quoted 6 thousand for a very very easy and much cheaper quality paint job.
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