Nice color coded world map with clickable ranking. Low debt isn't good by itself; it could mean the country simply has too little of intrinsic value for anyone to lend. Lower debt/GDP is somewhere below 60. But, again, you need to look at other factors including: social cohesion, population (lower is better, in general, since this is not a ranking per capita), natural resources (which could potentially be sold to extinguish debt), defensibility and tendency to "not participate" in wars, etc.
http://worldpopulationreview.com/country-rankings/debt-to-gdp-ratio-by-country
So this is potentially very valuable information -- but first you have to get "in", and then you need to survive. I also think taxes to GDP is a very valuable metric. A country with low Debt/GDP which can maintain a high standard of living without having to tax its citizens very much (low Tax/GDP) is especially hard to find. If it also has SOCIAL CAPITAL (coherence) it is truly blessed.
Under this sort of analysis, only a relative handful of countries seem to emerge relatively well as we go into The Great Taking.
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