As many have said, ultimately it is your money, and easy for us to spend
However, there seem to be A LOT of ways to get the work you need done for a lot less than what you have been quoted. Even if you were to spend the extra money, unless you get into another Boxster you will always be regretting the day you parted with her. I get upset when I go a day with out driving Sancha, I can't imagine never driving her again.