As am I:
I listen to HD25-1s and RS-140s in the house, and the atrios are right up there with them. The E4s not so much, because I dont like their sound (it has a very honest, uncoloured, un-weighted low end thats no fun, and the highs tail off a little, I think around 16k or so), but they are if anything better in clarity and sound seperation.
Dont be judging the little headphones too harshly. They can be great. (That said, £50 in ears are never going to compete with £50 cans, but you get to a certain point and they start to get very, very good).
Actually, I just saw that your going to see ackerc--ke, so I assume youre familiar with Nile? The guy that engineers and produces Nile swears by his future sonics (the top end, custom moulded, no-expense-spared driver model, mind you), saying that they blow Senn HD650s out of the water.