If exchange rates were predictable we would all be millionaires.
So why is it that psychics always live in the crappiest houses?
But I digress.
Pretty much all customs/immigration all over the world have a problem with anyone carrying over 10,000 of some currency. You don't say how long you'll be traveling, but you allude to carrying literally thousands of dollars on my body when i travel. I think it'd be a bad idea to have more than say, 5000 of some currency.
As for guessing what it's going to be like at some future point, 1000's (try to) make a living on FOREX. Go find one of the trial modules and see just how good your guessing skills are.

