Pure dirt works well. Its not that hard, just dig, compact, dig, compact, dig, shape, compact...
These are the top two berms at my mates and my trails- berm which ends in a slight bump, down a roller into next berm, which shoots you into the first double.
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Good lord Fergus. Those are fantastic.
The pics below show some of what I mean, I've posted them a few times before but they show what I mean. This berm took about 90 hours to build. Good quality stuff takes time but lasts for ages.
Or you could just build a pretty decent one in 3 hours, maintain it ocassionaly and you could spend the spare 80 hours riding it.