Need some help with finding a good zoom lens for an Olympus OM-D E-M10.

The current lens on the camera is an Olympus 14-42mm f3.5-5.6 EZ Interchangeable Lens for Olympus/Panasonic Micro 4/3 Digital Camera (Silver).

I want something with more zoom but not that pricey. So far I've settled on the Olympus M.Zuiko Digital ED 40-150mm f/4-5.6 R Lens (Silver) which is on sale for $99 (regular price $199).

Is there a better lens for this price range and camera or is this a good deal? Is this a slow lens compared to what I have, and does actually have more zoom then the 14-42 mm lens on the camera?

And is the Olympus M.Zuiko Digital ED 40-150mm f/4-5.6 R Lens (Silver) the same as this one on Amazon?