I have found Baja Designs and VisionX to have excellent LED bars - they are both probably one of the more expensive offerings however.

That said, unless you are getting good 10W LED's in your bar, with a reflector housing designed for LED's, you are much better off getting a couple of these:
and fitting these:
Daniel Stern Lighting Consultancy and Supply
(cibie H4 high/low beam, convex (domed) lens)

It will throw out so much more light than a crappy LED bar.