The last post by Parry has some great photos - they show a number of lovely camp sites. Thanks for this.
In reply to the OP, I would have to agree that Brachina Gorge is lovely, and Parachilna Gorge has some nice camp spots too. If you have a SA Parks Pass, Brachina Gorge camping is free.
We have stayed at Warren Gorge a number of times and its great advantage is it is a large area with a variety of different camping sites (hillside or down near the creek - which is usually dry, alas).