Btw, as far as open back HD598 vs SHP9500 goes (I'm sorry. I should have mentioned this in my original reply), it's a toss up really, depending on what you value more. The 9500 has less bass (very light), a bigger soundstage, but a grainy tonal quality across the frequency response. The HD598 has more/even bass (but breaks up at a relatively low excursion threshold), a more textured FR, but smaller SS. I like the 9500's more for video games, and the 598's more for music. - They are so similar though, that if you have one, you really don't need the other. If I'd have to choose, I would give the edge to the HD598. The FR tonality is just richer, and of generally better quality. They are also more comfy (one of the comfiest headphones of all time, if not the comfiest). - The 598Cs is completely different. Personally, I feel they have harsh resonance in the upper mids, slightly muddy low mids/upper bass, and treble drop off. Basically, I found them congested sounding. Not good at all for things like rock or metal, but if you are sensitive to treble, listen to more laid back music, and don't mind a more closed in kind of sound, then maybe they are an option for you. They are pretty even FR wise up until the upper mids. Like GoodBoy said, they are unique. At their current price point, I would not recommend them. The most I'd pay, compared to other cans on the market, is $80. - At $80, I would consider them based on their portability.
Under $100? - ATH-M40x or MDR-7506 is what you are looking for, if based solely on sound quality. However, they aren't the most portable. For portable use under $200, look at ATH-M50x (more comfy and sensitive than M40x, and include a small cord for easy use with smart phone/ portable DAP), Sony MDR-1a (international version), ATH-MSR7 (too mid/upper mid forward for me, and fatiguing to listen to music on, but you may like that sort of sound). Under or around $300? - B&O H6, Meze 99 Neo's, or Classics.
