You'll find a couple that will be as light or lighter than your stock bumper....LOD Armor Lite is one of them and is the one I have. I really like it....very well made, their powder coating is excellent, you can utilize your factory fog lights, and they go over and above with how they protect it for shipping. Also, and this was a deal breaker for me, it doesn't look like it's missing a winch if you don't wanna put one on. So many front bumpers look funny without a winch....they just stick out in front of the Jeep so far.
There are a ton of other bumpers, but a lot are really heavy and IMO look funny unless you add a winch.