There are some bassy 40-50$ headphones which with a bit of EQ and maybe light SRS / stereoX boost, if you know what you are doing, can sound like 100$+ one, and I'am not talking about overpriced cans here... But once you get there, it's very easy to mess it up, after what you'll eventually end up returning to flat EQ, so it's not for everyone. 
Some days ago there was a thread about EQ for different HP's, but due to lack of people knowledge and OP indifference with everything all over the place, it went dead.
Edited by SmOgER - 1/30/13 at 3:13am