For those potentially interested (on the loose subject of weighing up nationality and residency around the world) there are a few programs in the EU where one can spend less than €500k to get residency which pretty much gives you all the benefits of citizenship in terms of travel, work and residency to and within the bloc. Portugal, Greece and even Spain come to mind. After 5 years you can naturalize in countries like Portugal without needing to actually spend much time there in order to sell your investments freely and not need to worry about renewals etc.
In terms of a passport portfolio Argentina is good addition because it often opens up doors to visa-free travel to countries more difficult for many western citizens including Iran and Russia. Not to mention easier
residence (but not citizenship) requirements within MERCOSUR...well, as long as that lasts...
Although for $250k invested in property Turkey offers citizenship within 2
months and is ranked the same as Argentina
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www.passportindex.org