There are a number of people that run the Warn 8000lb winch and have had not issues especially if you get a snatch block. Many members with JKU's have ranged from 8000lbs upto 12000lb winches. I am running a 9000 lb warn and I went this route talking with another member with the same winch and similar accessories and it happened Warn had a great sale on the 9000lb winch.
Warning....You will get a variety of answers on brands and pulling power, just do a search on winches and several threads should pop up. Good luck with your choice!