Howdy y'all. A little background: I'm helping out my brother in replacing his recently broken 7 year-old or so Turtle Beach 5.1 headset. He's been borrowing my Sennhesier PC163D's, and really likes the detail level but wants more bass extension. For gaming, I see that open-back designs do really well. Isolation is of no importance. I recommended Sennhesier 558's with the possible foam mod, 598's, and Q701's with the possible bass mod. That's kind of the price bracket we've been talking about. We both agree that detail and imaging need to be good enough for serious competitive FPS games like CS:GO. We also appreciate well extended bass to match music preferences, the quantity thereof is not so terribly important. A part of the dilemma is that it seems hard to get well extended bass in open designs in this price bracket. He had chosen Sennheiser 598's (and a short ~$20 replacement cable with a 3.5mm tip)... After he decided on this, he started talking about wanting a DAC/amp to go with it (Fiio e17). I will coax a hard budget out of him tomorrow). Our worry regards reviews of the 598's we've both read mention that sub-bass is potentially quite lacking in these cans, and that overall bass could be described as lean, similar to the PC163D's he's borrowing now. TL;DR:: What would you recommend for this situation? Are there any headphones that can match the 598 + better frequency extension that would certainly be better (presumably un-amped for $$ sake) than the 598 + a possible dac/amp down the line? Phillips X1? DT990's? . The lower the price long term, the better. It's a big purchase, so my goal is to get this all right the first time, so we can set and forget. Bonus: I get recommended a hard case to match . And as a side note, I love the look of Q701's and will probably snag a pair at some point with some Audio-GD or Bottlehead gear... I need to save more money though . Thanks. EDIT:: Review on post #40.