As the latest sequel to the original iH5 and its many “flagship $100 iHome clock radio” successors, iHome's new iA91 ($100) is a "best of all worlds" mainstream speaker for iPods and iPhones, now with support for the company's iHome+Sleep and iHome+Radio applications. iA91 features design elements from both its direct predecessor iP90 and the more expensive iA100, largely including the iP90's frame while adding the stand-assisted front tilt of…