If the question is “Recommend a car where someone will almost certainly steal the catalytic converter and effectively write the car off?”, unfortunately
Replaced the cat, o2 sensor and middle pipe on our 10 plate jazz for about £300 when ours got done. Did the work myself but it's by no means a write off considering the availability of non oem parts.
If the question is “Recommend a car where someone will almost certainly steal the catalytic converter and effectively write the car off?”, unfortunately