Will game a lot so soundstage is important i suppose?
Other than that mostly trance music.
M50 for 129$, SR80 for 140$.
SR-80s are good but forget about long gaming sessions , the M50s to my ears sound extremely grainy and harsh ..so night gaming - no good , your ears will not be happy about the harshness
Why not take a look at the Brainwavz HM5 , subtle , much much better comfort than either , fantastic sound !
They slay my "better" headphones when it comes to bass ..they have a great extension , more mid-bass accentuation but still incredible for the price , extremely tight and well defined