I did some reading for this thread, but it's mostly on Persia (what the west incorrectly called Iran for many years) and 'Greater Iran'. So much land which is "Iranian" is now in Iraq, Pakistan (former British colonies), Azerbaijan, Turkmenistan, Uzbekistan, Tajikistan, and Kyrgistan, (former Soviet states), and Afghanistan (a buffer created between the Russian and British Empires), plus XinJiang (Province of China)
That is ignoring the past 60 years of US-British influence (post world war 2) in the region. Occupation during the war (to prevent Germany taking over) and the post war regime which the US put in place.
Given that as your school history (which i'm sure every Iranian school child learns) and the decade-long Iraq-Iran war of the 80s; I can't help but think Iran has a terribly legacy left-over. The want to be the regional power, and oppose Arab dominance... Nuclear weapons would help greatly, but economic growth would also kickstart a new development and rise in power. I'm sure they want China to treat with them, and India, but they are small frys in terms of population now.
Iraq and Afghanistan are lessons in US policy, but i'm sure the Iran is currently aimed to learn from it's lessons - weak neighbours makes Iran more important. Having China, the EU 3, and the US on side only makes sense for Iran, so a combination of weak neighbours and friendly relations with strong but distant powers leaves them in a pretty good position; and not needing nuclear weapons. Overall this looks like a good deal for 'world peace' at least in the medium term.