I am looking into purchasing a new Bluetooth keyboard to use with an iPhone 5S running the latest version of iOS. I am a VoiceOver user and like to use a Bluetooth keyboard for writing long pieces of text such as e-mails. I know that there are a lot of Bluetooth keyboards out there, but I don't want to just buy one; I would like some recommendations first. I am particularly looking for a keyboard that is not too cheap but not too expensive either (in about the £50-£100 price range) and I want one that is USB charged, has an on-off switch, is durable and responsive, is comfortable to type with for long periods of time and big enough to distinguish between individual keys but not too big so that I can carry it round in an average sized handbag; I would like one that is slim/relatively slim. I have read reviews of and heard people say good things about Logitech keyboards so at the moment I am leaning towards buying a Logitech keyboard so if anybody could recommend a good Logitech keyboard, that would be great; I would also appreciate recommendations of other makes of Bluetooth keyboard that are just as good as, or better than, Logitech ones.