Deals are out there. The stock SC is suppose to be serviced at 90k. Mine has 110K and running fine. I am waiting because I plan on a ported SC to replace it when it goes. You can hear when a SC is going. A test drive will let you know a lot.
As for the miles do what I did. I bought mine and was the 2nd owner. The previous owner was a woman in her 30s, so I assume the car wasnt beat on. It had a dealership oilchange/service reminder sticker on the windshiled which told me she had it serviced as recomended, plus carfax came back clean.
Like I said I bought my 99 GTP almost 2 years ago for less than 6k.