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iShuffle  2GB=$59       4GB=$79              10.7 grams(.38oz)    
      smallest, shuffles music  5colors 
iNano    8GB=$149      16GB=$179           36.4 grams(1.28oz)    
      plays music, games     9colors
iClassic 160GB=$249                              140grams(4.9oz)    
      biggest, has the most GB, games  2colors
iTouch   8GB=$199     32GB=$299  64GB=$399  115grams(4.05oz)  
      touch screen, games, Wi-fi internet   1color