Im willing to spend under 300 dollars on the upgrade. I prefer the headphones to be as light weight as the 518
What do you guys suggest?
Audio Technica ATH-AD900X
I think i understand what you want. With the HD598, the bass is present, but it lacks the impact. With V-Moda's, or any bassy closed back, the bass always has more impact and punch to it.
Why don't you go for the M100's then? They're a fantastic pair of headphones.