please read our forum rules. bumping is not allowed.
game zero is very bass light. its in the same family as the hd555/595, pc350se, pc363d. i would say going with an ad500x/700x might be better quality if you like bass light but its not going to be terrible. its completely your choice but i think for your budget you could do better than an all-in-one. also you said you wanted neutral not bass light headphones above.
bose 5 is overpriced. garbage in my opinion but some people like them. z906 is fair. okay for pc speakers but blown away by anything hifi. pioneer bs22 set is good but realize you need a receiver as well. a2/a5 are decent but remember they are small so not much in the way of bass and they are highly dependent on placement. i can certainly list a few products but you need to narrow down your choices - i'm not going to make a list just to have you ignore it.
depends on what you want.. you're all over the place right now. i think you need to give thought to what kind of setup you want and what purpose it will have.