You can get a winch mount bumper from Trail Ready, ARB, Kevins (not out yet but soon), etc.
Or Warn sells a front hitch receiver that is hidden behind the bumper and the receiver portion comes out of the middle grill slat on the bottom of the bumper. Then you get a winch mount plate that goes into the receiver. The nice thing about this setup is that you can remove the winch very easily when you don't want it. You can also move it to the back if you need to. The bad thing is that it sits kind of low and sticks out far so if you wheel with it in it drastically decreases your approach angle.
Here's one site with the receiver:
And heres a pic of the plate that the winch would sit on and go into the receiver: