I've been looking for a pair of quality closed headphones that i enjoy listening to with my Ipod without an amp. After some research, I've narrowed it down to these three options. So, which do you think is the best value for the price?

Forgive me for my ignorance, but would a pair of Denon D2000's sound good with an Ipod or sound like crap?

I have to get a pair of closed heaphones because I will be listening to music in a very noisy environment, and I don't like in-ear phones. At first I was looking at the AKG 271's, but I've decided that I'm willing to spend a bit more than that. So there's my price range.

that I can get for under 300 dollars?

Here's my situation. I am not an audiophile, but I can tell the difference between 128 and 320, so I'm not completely oblivious. I'm looking for a nice pair of headphones that cover my entire ears. I want them to be at least somewhat noise isoating, enough so that if I am riding in the car with...