
Sennheiser
HD 560S
Budget gaming king with clear sound, but tight fit.
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I consider discontinued HD330 (later HD465 I think) as the best on-ears I've heard, but they are pain to refurbish - no direct replacement for earpads or rubber/silicone headband strap (straps can still be in good condition though). There is a higher model HD340 / HD475 which I haven't tried, nor anything Grado. I consider the above to be better than 60Ohm Koss (not a comparison really), or the very popular HD480 Classic II, or some more current lower-mid level over-ears like HD559, but not as good as say HD555/558/579. I might pick them over HD599 though, just because I don't like the bloated tonality of HD599. So all in all, it is still not the level of hundreds of dollars, but very usable.
I've got the HD579 (from my understanding, they are very, very similar to the 599 in sound signature). I got them refurbished and on sale back in 2019 as my first open-back headphones. I've picked up so many other pairs since then, but I often find myself going back to the 579 as my work-from-home pair because they are just so comfortable and so easy to listen to.
PC360, PC370 and 38 owner here too They’re not lifetime but should do 5-8 years which is a long time for any gaming peripheral. The micro switch that mutes the mic when raising it tends to fail. Also some rubbery coatings especially on the DROP model wear and fade quite a bit with time.
HD5XX was the best I have heard. Second is the EPOS H6 Pro open back. But the best sound system has got to be the Bose system in the VE Series II Holden Caprice. Sharp, bass is very tight, and excellent imaging with its centre woofer, as well as front tweeters.
There are dedicated subs for audio which is more useful, but the truth is for the majority of PC use cases, any decent set of headphones is good enough. I have an ancient pair of Sennheiser HD5-- headphones that are still awesome. A monitor or any other PC part from that era is basically garbage today.
Sennheiser’s HD500 series models used

Sennheiser
HD 560S
Budget gaming king with clear sound, but tight fit.

Sony
WH-1000XM4
ANC king, durable, but unreliable mic and touch controls.

Sennheiser
HD 6XX
Legendary mids, durable, but narrow soundstage and weak bass.

Sennheiser
HD 490 PRO
Super comfortable, wide soundstage for gaming, versatile pads.

Sennheiser
HD 599
Super comfortable, easy to drive, wide soundstage, open-back.

Ranked #1
Sennheiser - HD 6XX

Ranked #1
FiiO - FT1 Closed-back Headphones

Ranked #1
Sennheiser - HD 560S

Ranked #1
Sony - MDR-7506

Ranked #1
Sony - WH-1000XM4

Ranked #1
Sennheiser - HD 560S