I need a pair as well but I really don't want to spend more than $60 realistically.
Then you have a bit of a problem. You see most of the good decent working gaming headsets are above 80 dollars at best of low price. Most of them are 100 to 300 dollars. For me the one that I want is the Sony's Pulse Elite headset. Maybe I can get it on the holiday.
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Just stay away from Gaming headphones. This means Turtle Beach, Tritton, Sony Pulse Elite, etc. Not only does the soundstage suck and the fidelity lacking because of their closed design, Pulse doesn't even use licensed Surround Sound technology.
Sennheiser PC360's are solid as well for a PC gaming headset. I still prefer the Sennheiser HD598 headphones which are priced very similar.
I have Astro A40 sound system and Sony pulse elites.
Best set up for sound is astro mixamp with Sony MDR-MA900 and a mod mic.
mixamp is $100-$130, MDR-MA900 is $200, and mod mic is $35. If this is your first gaming headset and your on a budget i would get the astro A40 sound system refurbed from astrogaming they are $199 . The pulse are descent but have a 4-5 hr battery life and it surround sound is average at best. I would wait for Sony next version of gaming headset that is made for PS4 .
What you want is the Astro Mixamp with either the Samson SR850's or Superlux 668B's. If you want chat, buy the Zalman ZM Mic1. It will take a future update to make chst compatable though. Best prices are on a Amazon and EBay.
If he is going to go that route, I can save him some more cash...he needs to look at the Monoprice 8328 headphones.
For $23 they absolutely DECIMATE anything under $80...far better sound and isolation than either set of cans you mentioned.
Both pairs I mention would far exceed these and head-Fiers hold them in as high regards as a $200 pair of AKG's. And any high end headphone that is recommended by audiophiles for gaming have this "isolation" that you speak of because they aren't meant to be bass heavy. Not the AKG Q 701's, Sennheiser PC360's, HD598's or Sony MDR-MA900's.
If you want bass & explosions, the headphones you mention are fine. If you want positioning for pinpoint accuracy and high fidelity, you want the headphones I recommend.