For those with over about 80,000 miles on their car, what have you had to replace/fix on your Grand Prix?

My GP is a 2000 GT coupe and has 140,000+ miles on it. I bought it with 70k miles, and it worked fantastically for the first 3 or 4 years..but since then:

I've had to fix the damn wipers several times--and the passenger-side one refuses to work right no matter how many times it's "fixed"

Replaced all tires

Replaced a cracked head gasket (to the tune of about $1,900--courtesy of GM placing the head gaskets in a way that requires the very labor-intensive job of taking the whole engine out)

Replaced the radiator/coolant system

Replaced one of the belts (can't remember which one, and of which the mechanic, whom is actually trustworthy, said was the most mangled one he'd ever seen)

Passenger window went out around 105k miles---too much money to worry about

One of the mufflers is unhinged (I can't see how I caused this if I did), pounding the pavement every time I go over a speed bump

Replaced the transmission last year (whopping $2,700)

and the list goes on and on...I guess it's a fact of life with high-mileage older GM vehicles