I too like the Big Mac index as a relative measure of cost of living the way that most people actually live their lives. I'd be very interested to see your new website once it is ready! Happy to provide some thoughts too if you're still hashing stuff out for it.
The other index should be called a Bankrupcy Index. Which would be a measure of a likelihood you'd go bankrupt or indebted forever, per country. Potentially extended with Credit Index - how likely is an average person to get a loan the size of local house, car or medical bill.
