if you're looking for full customization it is very good idea to sell iphone for the galaxy sIII. i used to own a 4s sold it to get the sIII im not regretting my decision the sIII is a very nice device. plus with android you can customize without very much trouble and the sIII has a bigger processor. i think the iphones have 600mhz processor afaik
correct me if im wrong.