I'm looking for a pair of closed-back over-ear headphones for $50-150. I use a pair of Audio Technica ATH-AD700s and a pair of closed-back Ultrasone HFI-780s with the Fiio X3 player. 90% of the time, the ATHs and HFIs are great, but there are times when the HFIs--which have never had great bass response--severely lack in bass even when I push the Fiio bass EQ to ten. I'm looking for a pair of headphones for those times, which is generally rock or electronica albums (Sigur Ros's "Takk", BT's "Binary Universe", Amon Tobin's "Foley Room", etc.).
Any help would be great.