Gift Guide: Choosing a streaming device without overpaying

NEW YORK — Why watch video on a phone or a tablet when you can get a device for as little as $30 to stream shows on a big-screen TV?Apple, Google, Amazon and Roku are all competing to be your gateway to online video. Which device you need will largely depend on what services you watch and what kind of TV you have.Of course, the device alone won't be enough. You'll probably want at least one subscription to a video service such as Netflix or Hulu, which charge monthly fees. Others, such as