I am using on-camera light sparingly, only when it is absolutely necessary. It's Anton Bauer 25W halogen, out of your price range, but in the line of the conversation it does not really matter.At the same time I set up two Lowel Pro diffused lights in safe corners out of guests' reach, pointed at the head table. I plug them in the wall via remote key-chain type power switches. So I turn the lights on and off as needed for the speeches, toasts, etc. I always discuss it with the customers prior to the party and explain why the lights are needed.
read here about it, maybe it will be interesting: http://wedding-retouching.com/blog/