I highly recommend Las Vegas Collision Center. I just got my car back today from some bumper work. I got it caught on a parking lot concrete bumper back in August 2014, and have been dealing with popping it back into place a couple times a week ever since, because I couldn't afford the $1000 quote I was given by another shop. I also had to have the entire plastic shield underneath my engine compartment replaced, as it was torn off. It was over $250 less than the original quotes I received from other shops. Mark also mentioned giving a discount for hearing about them through Yelp.
As if the price and the well-done work weren't enough, the customer service is fantastic and will keep me coming back here. The shop also knew me by name - whenever I called I mentioned I was checking on my Honda Civic, and they immediately responded with, "oh, hi, Amber!" When I walked in the door to pick it up, the receptionist greeted me by name. I felt very welcome and taken care of, which is often hard to come by in such a large city.