I'm looking to buy a new pair of cans. I've been using a Sennheiser HD428, but I I am no audiophile (yet), and I need some advice. I've been checking out a couple of headphones; Sony mdr v6 or 7056's, shure 440's. Among these which would you recommend, or if there are other sets that I can check out, I don't know much about these so, I guess a set that doesn't require an amp, and is within the price range of $0-$100. Thank you.