I've been using B&W P5s (my first pair of headphones) for about 3 years now and I've really been itching for an upgrade lately. At home, I have a 2.1 system, so I mainly use my headphones while at the campus library, on the train, or sitting in my backyard. I prefer over the ear headphones and since I use them on the go, isolation is pretty important.
I was looking into the Sennheiser Momentums for a while. Someone advised me that, while I would probably notice a difference in sound quality from the P5s to the Momentums, I wouldn't notice a $350 difference.
Everything I've read about the Mad Dogs make me want them. The reviews make them sound like exactly what I'm looking for and I've been itching to get them. The only thing that stops me is that I mainly use my iPod/laptop as a source. At home, I could plug them into my receiver if I was looking to use them there but I don't currently have a portable amp.
Would they be viable to use on the go without an amp? I know that they would sound much better when driven properly so is it something I shouldn't even consider? What about if I were to try and get a portable amp?