Hi, I realize that this thread is kinda like almost a year old, but would just like to share anyway.
Between myself n my partner, we have 2 very early nanos ( the white ones with scrolly circle bit and metal back, like an iPod classic), one of those slightly newer nano ( still round scrolly, curved shaped) , 2 iPhone 4 , both hooked up to mophie cases ( one plus and one air) an iPad 2 and an iPad. So you can see we have a massive number of chargers.
One thing we realised: doesn't matter what your device is, feel free to plug into iPad charger. Everything just winds up charging faster on it coz of the stronger current. Nothing will blow up. And doesn't matter about the cable, they are all the same.