I've been using my dad's 1970s headphones which still sound really good, but there's some sort of loose connection which is making them unusable. I have some Sennheiser HD500s, but they just don't sound the same anymore, after the better 70s ones. I'm looking to buy some for about $100, maybe up to $150 if they're really good. Do you have any suggestions? Also, if someone knows a lot about headphones, I want to know if I can do much better than my Sennheisers for that price range. Thanks.