I'm going to start off by saying that I'm not familiar with what top end headphones sound like or should sound like. As of right now, I'm using a pair of HD212Pro's as I really like my bass. That being said, I'm not happy with the output of these, or any headphones I've tried. A buddy of mine had a boostaroo amp laying around which he let me try out, and that did increase the volume, but from what I've heard, these 212's are supposed to have amazing bass. Being that I'm really wanting to put on a pair of headphones and be blown away, I'm not sure what to do. Will I notice a difference if I invest in a good amp and will a good amp provide better results then this boostaroo thing? Should I just go with a higher end set of cans? I've been looking at the Grado line and have read great things, but at the same time, I'm sure I'll need a good amp to drive those.