So, I don’t have a whole lot of time to drop a ton of recommendations but heres some guide that should definitely help you out
alright now I have some more time @Sacrificing lol. So it will definitely depend on your sound preferences… M40x is more along the lines of a V signature if anything nice bass pretty close to neutral mids and raised highs… it’s not real bad honestly and is portable too as well as has a bluetooth adapter for it to make it wireless plus the fact it can make use of a 2.5mm boom microphone. I will post some recommendations below the guides I listed.
https://www.reddit.com/r/Zeos/comments/9v45wr/zguides_dac_amp_combos/
https://www.reddit.com/r/Zeos/comments/97mi5s/zguides_headphones/
Depends on the headphone.
Alright so heres some recommendations from me.
Tygr300R: Warm, Bassy, slightly elevated highs, very large soundstage, somewhat aggressive and intimate, extremely comfortable and light, great all rounder, doesn’t need an amp and if you can’t drive it loud enough can use like a $20 sound card or something to get it loud. Alternative Fidelio X2HR from philips this is bassier and has more elevated highs though perhaps a bit too bassy for competitive gaming either way it’s compatible with V-moda boom pro due to the detachable cable and can make use of a 3.5mm bluetooth dongle adapter to turn it wireless if you think the bass is an issue the neutral bright shp9500 has the same compatabilities and is nice too. Doesn’t particularly need amp here but again the sound card or something works fine if you wanna budget
Planars in your budget that sound great: For more bass definitely 100% the T50RP this is the base form of the Dekoni Blue( V signature ) and the Argons and is extremely moddable very changeable sound overall and really nice. The alternative here in my opinion would definitely be the Hifiman Sundara relatively bass light but amazing detail clarity and sparkle on those highs with quite a good amount of timbre imo. Definitely need a powerful amp
Unique Sounding headphone: Nighthawks/Nightowls(semi open/closed) these are more dark and warm sounding so may not be the best for competitives in my opinion but still awesome with great detail and great bass especially in the low and mids. Discontinued but can be found here and there. Another unique one to list here would definitely be the Verum 1 mk2’s absolutely gorgeous headphone with a good sized soundstage nice bass great detail but relatively dark sounding. Need an amp
Super basshead lover headphones( these may go outside of budget but good to know for future eh?): ostex TR-x00(purple heart, Mahogany, Ebony. Discontinued but can be still found more linear soundstaging though), Emu Teak(V signature). these need amp
Balanced sounding: This would be your sennheisers. You can grab the HD 558/559 if you prefer a little more bass and a larger soundstage, HD 598 for a more balanced sound with that large soundstage, HD 599 for a little more bright with again more balanced sound and large soundstage these are all compatible with a 2.5mm boom mic and maybe a wireless dongle if you can find one. Step up from there definitely the 58x Jubilee very well rounded a lot of detail wonderful vocals though can’t make use of the 2.5mm boom mic this is a duel sided detachable headphone as such you can purchase the extra accessory that makes this headphone balanced which really makes them sound great. These generally don’t need an amp but it can help
Bright Headphones: Definitely more towards the Beyerdynamic brand here. DT 770: bassy somewhat recessed mids and bright closed back quite nice not for everyone though. DT 880: One of the competitive gaming gods of headphones bass light neutral mids raised highs quite a lot of detail and sparkle. DT 990: only take this one if your okay with a ton of treble this is extremely bassy recessed mids and extremely sharp treble requires an amp that can settle that treble down. These headphones sound their best in their highest ohm requirement and are much more refined therefore you definitely want an amp around the $100 range to power them. 250 ohms for 770 and 600 ohms for 880 and 990. Lastly here I would bring up the HarmonicDyne Helios. This is pretty new has a very nice natural bass and treble with a good punch in the treble but not real heavy bass… vocals are decent enough with a fairly deep sound to it and fairly moderate soundstage. Very pretty looking headphone and a good alternative to something like the Sundara or DT 880
$100 amp recommendations. Monoprice Liquid Spark, Schiit Magni 3+ / Heresy, JDS Atom, Topping A30. Spark pairs best with brighter headphones.
just general Dac recommendations: to cut costs and still have a great dac I would recommend just grabbing the Topping D10 or the slightly more expensive E30
Amp/dac Combo units: IFI Zen Dac(this has a balanced port good if you want to go for that sennheiser 58x jubilee too), Schiit Fulla(low power so not great for very demanding headphones, Schiit Hel(can power practically anything and sound good, If you prefer a more chatmix or gamer type amp/dac soundblaster x3 or g6