You may or may not remember last year's iHC5, iHome's early and little-publicized attempt to fuse an alarm clock radio with a mobile phone-ready speakerphone. This year, iHome has completely overhauled that design from top to bottom, replacing its matte silver paneling, separate iPod/iPhone dock, and Bluetooth 1.2 support with more sophisticated iPhone-ready components. The result is iP47 ($200), which includes internal iPhone interference shielding,…