Yes open are better for gaming, as there is a more open soundstage, but if you are just doing some relaxed stuff as I do, it should be fine. I'm not purchasing any dedicated gaming headphones as I do not play enough to be able to justify that.
Again, for hip-hop (my preference) and anything else, the mdr v-6s are great with an even response from all sides. The bass is tight and accurate.
The deciding factor for me when buying these was the high sensitivity. They can easily be run from a small iPod or iPhone and do not need an amp to sound great.
They've dropped to 65 from 70 at b&h with free shipping!
If you feel the need to spend your $150, do so, but I think you would be very happy with these.