another, cheaper, option is a good spectrum analizer
the guys who make equim (very good eq)
offer one for free
check some refrenence cds you like and compare,
kinda of like a guitar tuner, it don't lie.
i mix into samplitude from protools, and after years
of having samplitude around
i just figured out that i can check my mixes in real time as
i am recording them into samplitude
another option is a new plug by voxendo
one of the eqs that analizes, still another, harbal eq
all good tools
got to luv having a pc around along w the protools hd/ mac trip