My girlfriend is looking at the Windows 8X, the Nexus 5 and the iPhone 4S unlocked. I am iOS biased and do not know enough about the Windows and Android options. What is the longevity of the Windows phone? How dated is it and how effective is it as a music player? Currently her music is all on iTunes if that matters for this. I have seen reviews on the Nexus 5, so what are your thoughts on it? And for price comparison the 8X is $250, the Nexus 5 is $350 and the iPhone 4S is $450. Thanks!