Afghanistan: Afghanistan is a place with no real government or control of it's people. It's basically the wild west of the modern age. You can do whatever you want and there's a good chance you'll get away with it. Our enemies combined with the radical clerics provide that the fighting will never end in Afghanistan (even after we leave). I don't think we can trust them for anything.
Pakistan: Is more of a threat because their state sponsors terrorism such as Hezbollah. They harbored Bin Laden for years. The even have cut off our supply lines for political squabbles in the past. I would say Pakistan out of any on this list is the most untrustworthy and the most likely to stab us in the back.
Egypt:
Saudi Arabia: Saudi Arabia turns out to be a good ally....mostly because we need fuel, they have fuel, and they understand they can make a killer profit off of us by just being friends with us. Secondly the Arabic world has been feuding with the Persian world (like Iran) for centuries. Most of the countries we are against have been Persian...so we're actually helping them. I think we can marginally trust them.
Iraq: Iraq is a shell of it's former self. It'll take decades for it to get it's act together. Other than sharp edged words they don't have anything to hurt us with. It's not that I wouldn't trust them, it's more that I wouldn't bother asking them, because their troops are incompetent. The radical clerics are present here too.
Israel: Israel is one of our greatest allies and I'd say we can greatly trust them. However make no mistake that Israel knows how to manipulate us. Anything they say should be taken with a grain of salt.
France: Who listens to France anyways? They're the butt of more jokes than not. I see them about as harmless as a penny in a pond.
South Korea: South Korea is a good ally because they need us. Without us the North would annihilate them. So we can trust them because we have them under threat. If they piss us off enough we'll leave and they can deal with the little Kim.
eace