Samsung Magnet, Flight, or Sony Ericsson C905a?

[STARBIX]

Samsung Magnet:

http://www.wireless.att.com/cell-phone-service/cell-phone-details/?device=Samsung+Magnet+-+Orange&q_sku=sku3730229

Samsung Flight:

http://www.wireless.att.com/cell-phone-service/cell-phone-details/?device=Samsung+Flight(TM)+-+Grey&q_sku=sku4150226

Sony Ericsson:

http://www.wireless.att.com/cell-phone-service/cell-phone-details/?device=Sony+Ericsson+C905a&q_sku=sku3880241