I did the same backing my X into a cement post, damaged the rear bumper fascia. It was only 44 bucks to replace with Nissan courtesy parts. I imagine the whole front plastic bumper is a lot more, but you can check out the replacement cost and do it yourself. Guess it depends on how bad that crease in the bumper bugs you.
I suppose we should watch where in the hell we are going in the first place though! Good luck.