Well I gave this one a lot of thought and they seem like the cans of choice, a buddy of mine (who is also my boss) swears by the DT-770s as the holy grail of FOH headphones. Plus they're a fair bit cheper than the Senns, and also appear to be sturdier.
Should I go open back (990)or semi-closed (880)...these will be my primary mixing tools since I don't have a pair of monitors and it doesn't seem likely I will be getting a pair anytime soon (I only track myself these days anyways).
Should I go open back (990)or semi-closed (880)...these will be my primary mixing tools since I don't have a pair of monitors and it doesn't seem likely I will be getting a pair anytime soon (I only track myself these days anyways).