So you are located where in Florida? Anywhere near Pedro's Garage?
Is the car apart? Just how did the mechanic determine what he told you were the causes of your leak(s)? What is his reputation?
When I bought my second Boxster, the Pre-Purchase-Inspection I had done told me I needed similar things and I negotiated on price to help pay for some of them. Yes I bought tires and alignment and brakes and a few other things and had a 60k service done but then the car was good for the next 5 years or more.
In your case, I'd go ahead and do the IMS unless the mechanic has done a camshaft deviation test to tell you it is rock solid and even then I probably would just to enhance the car's value. And I'd have it done by someone who had already done 20. I don't want him doing his first on my engine.
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