As Otter and other companies are aware, an $80 price tag can buy a lot of iPod case?a fact that Atlantic has used to serious advantage in its new EGO iceBar2 ($80). Here, those dollars get you not just a waterproof iPod nano case?one that?s incidentally compatible with first-, second-, and third-generation iPod nanos?but also a pair of legitimately nice, battery-powered speakers, an integrated rear stand, a rubber wrist strap,?