T-Mobile may be the smallest major carrier, but that doesn't mean it lacks a decent selection of phones. In the past few months the company has introduced two music phones that won our praise. The Motorola Rokr E8 offers an innovative "ModeShift" keypad, a 3.5mm headset jack, and a well-stocked music player that delivers on performance. The Nokia Xpress Music 5310 also brings a nifty music player to the table, but it packages it in a more traditional design. So, which is the better cell phone for listening to your tunes? In the latest CNET cell phone Prizefight we pit the Rokr E8 against the Xpress Music 5310 to see which handset comes out on top.