As sequels to Marware's long-standing series of hybrid cases-slash-armbands, the two Sportsuit Convertibles for iPod nano 4G ($30) and iPod touch 2G ($35) both come with the same pieces: a neoprene and clear soft plastic case sized for the device, a matching armband, a hard plastic Multidapt belt clip, and a key pouch. You can choose to use the case alone, with the armband and key pouch, or with the belt clip; it's very substantially protective, with…
