Soundfreaq Sound Step
You might not have heard of a company called Soundfreaq (they're certainly not as well-known as Bose, JBL or Philips), but they have a Lightning-equipped iPhone speaker dock that a lot of people recommend. It comes with Bluetooth and even the ability to do Composite Video Out from an iOS device onto a TV or monitor.
For the size and lightweight quality of the dock, it packs a lot of sound quality, and while many folks say it doesn't get as loud as some other speaker docks, it can still get quite loud and easily fill a room without much of a problem. It's priced at $123 on Amazon currently.