Heyo subterminal303
I'd like to clear some things up.
Pretty much ANY competent made stereo headphone will crush a true 7.1 surround sound headset. It's not really an opinion, but most gaming headsets are made cheaply and aren't tuned rightfully ie. the sound suffers alot. The SHP9500's you've been looking at yourself would be an amazing choice as of a pair of stereo headphones. They're cheap and deliver performance way above their price class. I have used them myself in the past and I'd like to compare 'em to the Sennheiser HD650's, however with a bit more treble.
Any day of the week I'd go for a headphone + mic setup instead of compromising and going for some gaming headset. However, when that's said. There is actually some competent made gaming headsets, but again these cost around $200+. Here I'm talking about fx. Audio Technica ATH-ADGx1's. Those are basically a pair of AD700x's with a mic slapped onto them. Great concept, but way more expensive that just taking a knock-off pair of headphones a attaching a mic.
Going back to the whole 7.1 surround thingy. Virtualized 7.1 is Imo better than the true 7.1. I say this because VERY rarely are the true 7.1 headsets drivers tuned right and this means that they're out of harmony. This means when you turn fx. in a game the drivers won't coop and create a 3d sound effect as desired. When virtualizing it you have the ability to fine tune the EQ for the 7.1. This gives more flexibility and is cheaper for the manufacturer.
Now that I've cleansed my soul (lol) I'll put something I'd recommended for you. I will actually be putting some gaming headsets, however these will be based on an already established headphone that just got a mic slapped on.
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Kingston HyperX cloud II
https
/www.amazon.com/HyperX-Gaming-Headset-Nintendo-Switch/dp/B00SAYCXWG/ref=sr_1_1?ie=UTF8&qid=1523428725&sr=8-1&keywords=cloud+2
These are basically some Takstar Pro 80's which has the mic. A fine entry level headphone which got "upgraded" to a gamer headset.
Phillips SHP9500/s
https
/www.amazon.com/Philips-SHP9500S-Precision-Over-ear-Headphones/dp/B00ENMK1DW/ref=sr_1_1?s=electronics&ie=UTF8&qid=1523428885&sr=1-1&keywords=shp9500
There's literally no difference between the 9500 and 9500s. The thing they changed is just the cable to something of slighty lesser quality. But who cares. There's a standard 3.5mm AUX port for custom cables.
Audio Technica M40X w/HM5 pleather pads
M40X's
https
/www.amazon.com/Audio-Technica-ATH-M40x-Professional-Monitor-Headphones/dp/B00HVLUR54/ref=sr_1_1?ie=UTF8&qid=1523428991&sr=8-1&keywords=m40x
HM5 pads
https
/www.amazon.com/Brainwavz-Replacement-Memory-Foam-Earpads/dp/B00MFDT894/ref=sr_1_cc_2?s=aps&ie=UTF8&qid=1523429027&sr=1-2-catcorr&keywords=hm5+pads
I personally find the M40X's to be crumbled by their comfort. The sound is great for the price, however the comfort makes them unbearable. Therefore I REALLY suggest to get some other pads on them. You could start with some HM5 pleather pads.
Sennheiser HD559
https
/www.amazon.com/Sennheiser-HD-559-Open-Headphone/dp/B01L1IIEKM/ref=sr_1_1?s=electronics&ie=UTF8&qid=1523429156&sr=1-1&keywords=hd559
Open-back Senneheisers. Love this headphone for what it is. The sound isn't really flat, so it won't be a huge leap from anything else you've tried, however the clarity is miles ahead of most gaming headsets.
Sony ECMCS3
https
/www.amazon.com/Sony-ECMCS3-Omnidirectional-Stereo-Microphone/dp/B0058MJX4O/ref=sr_1_1?s=electronics&ie=UTF8&qid=1523428798&sr=1-1&keywords=sony+lavalier
A fine lavalier mic that will serve you fine until you decide to get something better.
Fiio E10k
https
/www.amazon.com/FiiO-E10K-Headphone-Amplifier-Black/dp/B00LP3AMC2/ref=sr_1_1?s=electronics&ie=UTF8&qid=1523429423&sr=1-1&keywords=e10k
This a Amp/DAC combo. The amp part really isn't important in this case, however the DAC would likely increase the clarity of you sound since you DAC comes out of a noisy environment.
This is not needed, however would be a nice addition.
Cheers.