i second the nike, i mean you kinda answered your own question when you said it had to work with nike +. I've had two nike armbands the current one and the previous. Both recommended. THe new one though hides the nano, so you can't see the screen or controls which suck. oh and that nike + running tracker has an RFID in it, from what i've read you can be tracked. Plus you have to by a new one when the battery dies. any way that's my .02