I really like Portra film. The reformulated film has excellent color and much more latitude than slide film.
When I traveled, I was always very cautious, especially when in countries ruled by totalitarian regimes. In my case, it was China. And when I was in Tiananmen Square, for example, I didn't push my luck. I generally always felt safe in China, except for the time when I was taking photos near an embassy (and didn't realize it), and the guard almost began to chase me.
But I did the same things that I suggested: photocopy of my passport, extra RMB and kept my passport in a body wallet under my clothing. I think these are common sense things.
A colleague had her passport stolen (can't recall which Asian country), and it was a major ordeal getting it replaced.
I also had a colleague's wife get ripped off in Hong Kong -- group of youths surrounded her. One sliced her backpack and removed her wallet. Within 30 minutes, they had maxed out her cards.
I just think you should always be cautious. Not paranoid. Just be aware of your surroundings, especially if you're an American in a country that is hostile toward the U.S.
Just ask those dumb American hikers -- of whom two are still sitting in an Iranian prison. And it doesn't matter if they're political pawns. The bottom line is that they're still in prison.
Of course, this might not apply to you with regards to Iran.