re: Fix the car or get a new one

So spend $1,500 to have a car in relatively good shape, or $25,000 to have a car in better shape (but likely out of warranty also)? Really just depends on your financial picture. If you can afford a new car, go ahead.
BUT
90,000 is nothing for a modern car. If you want to use it as an excuse to get into something better, more power to ya, but it has a lot of life left. I don't see a lot of upside to trading in now rather than a year or two down the line - assuming nothing else expensive breaks. The depreciation curve on the Mazda is flattening fast, and it's paid off.