Having lived for a year in Rio I can vouch for Brazillians... specially if you are active and like sports, also dancing, etc. Brazillian cuisine is awesome too... ask her to prepare some "Quindim" for you! I REALLY miss a proper Feijoada (if anybody knows where to get one here in BA please holler)
Porteños/as tend to be more "Italianish" in their ways, so the drama factor seems to be ever-present. I can't complain about my wife tho, she is amazing and is a great mom too
"Wow!" at some of the neanderthal attitudes here! ;-)
Despite my low opinion of the locals I've met up 'til now, I'm still completely open to meeting one and even settling down with one (the eternal optimist!) but I don't give a damn if she can cook and sure as hell wouldn't expect her to be the 'little lady tied to the kitchen sink'.
Actually, if she has a career and can earn a decent wage, I'm quite happy to be 'the little lady tied to the kitchen sink' myself! ;-)