Just FYI-

Catalytic Converter.........between $200-300 installed. A Cat will cause numerous problems with the engine, if the cat is damaged the engine won't be able to breathe.

Starter..........Between $100-400 installed.

One hell of a lot cheaper than a new/used/leased car.

Pay a good mechanic a little money to go through it (NOT A DEALERSHIP!!!!!!!!!!)
Find a local mechanic who people trust.

FIgure out what is critical to the car, and figure out cost. Chances are it will be cheaper by a short ton of money than buying or leasing anything.