Thanks again! I didn't know the U3 offered surround sound! I am convinced to go for the U3.
Is it a good match up with the AD700? I realise that gaming requires a large/wide soundstage, but I also want a normal pair of headphones for rock/classical music. Think the AD700 come the closest to satisfying all this.
I can't speak too much to the AD700 as I haven't heard it in several years. It didn't fit well either so I'm pretty sure I wasn't getting the most out of it. I have a larger head, but it's a little more oval shaped, and narrower from ear to ear, so the wing design on the ATs is absolutely horrible to me. Others swear by its comfort. It's an entirely personal headphone. Also, I remember there being a lack of low end that just sounded unnatural. But that's my sonic memory.