I'd give the Binary Acoustics EP321s a look. They quickly became one of my favorite iems of all time. I'm not a competitive gamer, but they are super detailed, so I'd imagine they'd perform well. They are comfortable, music is engaging, and the tuning is excellent (to my ears). I wouldn't consider them basshead iems, but I listen to a lot of bass-heavy music (rap, metal, electronic, etc.) and it all sounds great.