I've tried M50's, own Q701's, and am very familiar with HD598's and the Phillips X1's. M50's can sound neutral at lower volumes, as you hear less bass and treble and your brain focuses on the mids. I'd double the X1 recommendation if you can save up the extra cash. For a mic for gaming, I'd suggest looking into the Zalman clip-on, the VMODA BoomBro cable is not the best and it's quite expensive. The DT990's would have the bass you want, but they'd want an amp for sure, I'd check in one of those threads about cheap amp options. They're also semi-open, so they might half-isolate?