Hello there Head-fi'ers. I've recently gotten into the hobby and I'm looking to upgrade from my Grado SR60i. I am a very heavy headphone user, wearing them 6-8 hours a day while I work, so comfort is EXTREMELY important. In addition to my Grados, I have a pair of Etymotics ER4p, Klipsch S4i, and Koss KSC75s. The Klipsch aren't in the rotation because the sound quality just isn't there but when I'm working right now, I switch between the Grados, Etys, and Koss because each pair is uncomfortable in a different way so once I get tired of one pair, I switch to another. I desperately need a set of cans that I can wear for hours. My primary music genre is jazz with some vocals thrown in here and there (Adele, Norah Jones, stuff in that general vein.) I am not a fan of bass but of course there has to be some there to round out the sound. Mids are very important to me as you can probably guess by my preferred listening habits. Highs need to be there but not be harsh and fatiguing (I'm lookin at you SR60s.) I'll be running through a Fiio E07K connected to my computer so higher impedance up to about 80 ohms or so shouldn't be a problem. As for tonal quality, I like the sound of my Etymotics the best out of my current phones but I would like a bit more bass than they offer, as well as a bit more "fun" sound. They are very detailed and neutral but sometimes I want a bit more like the KSC75s offer. I think I've narrowed my choices down to the Sennheiser 598 and the Philips X1 and I'm leaning more toward the 598s because from what I've read the X1s might be more bassy than I would like. I'm open to other suggestions of course. Price range is no more than about $250 if possible. Much thanks in advance!