PC gaming and want Bass... Not sure how that gels.. What titles specifically?
Under 100, there isn't much. At that point any 50mm driver will deliver plenty of bass, even the HTF-600s. However, I highly recommend the AudioTechnica AD700. They are bass light but are easily the best gaming headphones if you want to hear the game without massive amounts of mud being slopped into your ears.
Seriously though, at 100 you can't get kicking bass and mid-high response.
Whatever the most expensive sennheiser you can afford will give you a great bass response, but will drop resolution anywhere else.
To be perfectly frank, if what you are looking for is something like the sound Beats gives you, then buy those.
I suppose the Custom One Pros are also a good bet, now that I spend more time thinking about it.
I'll repeat: The HTF-600 from panasonic are easily the best bet for what you are looking for. Regardless of price (sub 400 that is), however, for positional audio get the AD700, and if you must throw money away, get the Custom One Pro.