HD 505

While 6\*\* series are great headphones, I wouldn't recommend them for gaming. Their pads do wear out over time, which affects the sound. I assume since you'll be using them for long hours, you might not get to enjoy them to the same degree for too long. And replacement pads aren't always available, nor they're cheap. 3rd party replacements are never the same as the originals. You also have the issue of being unable to swap the cable for one with a boom mic. My suggestion would be to go for one of these: HD560s, HD505, HD550 or HD400 Pro and then pair them with HD500 BAM to get the mic functionality, if you need it. Do consider HD490 Pro if you don't need a mic because that's both the most comfortable and the best sounding headphone that I own. You can use them for hours without any issues. Personal tastes differ, of course. Some still prefer the 600 series.

Thanks! Do you have a budget in mind? Sennheiser has a number of comfortable open-backs that are tuned more on the warm side, such as the HD 505 (though I prefer the more neutral HD 550), HD 650, and HD 650. This is probably a good starting point. Comfort on these is pretty good as well (especially the newer models).

They are great. But if you want a more laid-back presentation you could consider the 550, 505, or 599. 560s are kind of bright and analytical. This can be fatiguing for some people.

Sennheiser even sells a boom mic for the 500 series now. I got a pair of 505s and its so nice having the convenience of an attachable mic without having to sacrifice sound quality.

Fiio FF1 (sadly mic doesn't seem to work - possibly OMTP vs CTIA incompatibility I've not looked into it) or Sennheiser HD505 (sometimes I hook up the Fiio QX13 for a better audio experience). I don't really do wireless personally.

I’m not an audiophile by any means but rather a casual gamer looking for a premium pair of headphones. I recently picked up the 505 and I’m really enjoying it. I do wish the bass was a bit more bassier for lack of a better word. Everything else is wonderful.

You don't really have to worry about impedance unless you would want to use some super low impedance IEMs. I've checked the spec, but I can't find power output of your player, that is a weird thing to omit when they output impedance and even IMD listed. Since it is based on CS43198, it should be able to get 2Vrms from unbalanced and 4Vrms from balanced into high impedance loads, but if there is more or what is the output into low impedance is unknown. Given the price of the device I would mail/call their support and demand exact information about output power. Anyway if the 250Ohm recommendation you got was DT770/880/990 then, that would not be a very good one as those headphones work only with unbalanced connection and their 250Ohm variant needs 2.5Vrms to reach 110dB SPL (loudness). So among Beyerdynamics models an 80Ohm variants (so only DT770/990, as there is no 80Ohm DT880) would be much better pick since they only require 1.4Vrms for that. You should be fine with anything from Sennheiser from 500 series, so HD560S/505/550, including possibly HD58X from american Drop store, and also HD490 Pro. I would not recommend going for 600 series which will work fine, but in their case I would advise getting balanced cable for those and if balanced output in your player is limited to 4Vrms, I would say 600 series can get better with more. Aside those you might want to take a look at planars like FiiO FT1 Pro and Hifiman headphones, but I do lack experience with those so can't tell much. Spec wise FT1 Pro should run fine even from 3.5mm unbalanced, while Hifimans can vary a lot depending on the exact model. Be warned though, Hifiman is kind of known for poor reliability (but also for not making problems with warranty claims and just replacing faulty units).

For my overly sensitive 59cm head the comfiest over-ear are (in USD) 1. old $30-100 Sennheiser HD565/545/535 from the mid 90s 2. $50USD Philips SHP9500 From the ones I haven't tried but are said to be super comfy 1. $1500 Sennheiser HD800S 2. $350 Sennheiser HD490 Pro Most of them have velour earpads, with the exception of SHP9500 which has like nylon braided cloth, and HD535 which is vinyl or whatever that plasticky thin fake leather is. That whole series though might require some maintenance. However prior to my head becoming overly sensitive, I found modern 500 series Sennheisers to be very comfy (well, HD555 are still comfy for me, but the newer ones have more clamp) - current models would be HD560S, HD550, HD505. Also HD600 which I still use, just have to take breaks (but I'm coming around to the idea of permanently bending the metal headband strip using pliers...) - during which I use flathead earphones like Faaeal Snow-Lotus 1.0 and Qigom S300, or on-ears like Koss KSC75 and very old Sennheisers HD330, HD414X and more.