I am looking for a good car charger for my new iPhone 5S. I ordered one off of amazon, which I thought was good (I had a similar one for my 4s that served me well for the whole time between the 4s and the 5s) but the phone says it is not 'supported.' Does anyone have any real world experience with good chargers that are 'supported' by Apple for iOS7/iPhone 5S? It seems some sellers on Amazon are saying they sell certified Apple chargers but they still give the phones an error message saying the cables/chargers are not certified. Thanks!