So subjective... the AD's are twice as expensive. Are they twice as good? What does "twice as good" mean in the terms of headphones?
If you want the best price/performance on the market, that would be the Monoprice 8323 for $20. They are outstanding at that price.
So now that we have established that anyone with headphones that cost more then $20, starts to care more about pure performance over value, it becomes up to you to decide when to stop.