Let's see... the catalytic converter blew up. No, it didn't break down. IT EXPLODED. The motor mount also broke into two pieces, and it's leaking rear differential fluid. Other than that, I've had to replace the brakes, which is routine maintenance, so that's nothing to complain about.
I love this car to pieces, which is exactly why I keep shelling out the money to fix it every time something goes wrong. It has such character. Kind of a grandpa car, but that's what gives it its charm. It's fun looking too... you certainly won't lose it in a parking lot! The steering is very loose, which I like. Overall, it's a nice car, if you don't mind it nickel and diming you from time to time.
You are doing the right thing by continuing to fix it. Regardless of what anybody tells you, the notion that "an old car will nickel and dime you to death" is an absolute myth! So every few months maybe you have to pay a couple hundred bucks to fix something. That sure beats making a $500 car payment every month, plus the extra insurance that the finance company makes you carry on "their" car. That differential leak might be a fairly easy fix if it's just a matter of replacing the axle seals or the differential cover gasket. Keep checking the fluid level so you don't burn it out.