Bajo_cero2 said:Yes, there is one, a huge one.
We are debating about that here:
http://baexpats.org/expat-life/10765-new-rentista-visa-requirements-6.html
Essentially, if you have a lot of stamps in your passport you may full fit the requirements for apply for citizenship.
Going to Colonia is a bad idea. Read the debate there.
Regards
What are the implications for your other citizenship? I read they only had "agreements" with a handful of countries. Other than those listed would you have to give up your citizenship?