I would call the current residential products a work in progress. Cree is one of the leaders. See: http://www.cree.com/
It's an USA company that develops and sells everything from the LED chips to complete lighting fixtures. Lighting Science is another. See: http://www.lsgc.com/
Some of their products are sold at Home Depot. I bought a LED disk light to solve a unique problem I had. A disk LED light is intended for a plug-in replacement for a ceiling can light. It's a disk type lens with the LEDs in it. A small module is included that converts the AC line voltage to DC for the LEDs. My application was for an outside porch light that mounts on a soffit right above a out swinging door. It must be very shallow to clear the door top. The LED was the only product that would work for me. It was expensive, $39 or so. I'm very happy with it. It is not instant on, it's only drawback.
When buying make sure you understand color temperature. If you want anything comparable to incandescent light it must have color temps of 3000 or lower. Anything higher is a harsh blueish white. New designs mix the LED wavelengths from several different LEDs to get the desired spectrum. Other designs use phosphors similar to that in a color CRT. I'd delay buying anything now unless you have a special need. The lower cost products are coming.