As Marware's high-end rubber case for the second-generation iPod touch, the two-toned Sport Grip Extreme ($25) comes packaged with screen protection and a cleaning cloth. Like an earlier iPod nano version, there's a distinctive red, white, gray pattern in the case's back, with the rest of the case either black, pink, or white. Literally the entire iPod touch is protected save for its headphone port; there are button covers and a bottom slit that opens…