I don't see why this monitoring thing is so complicated.
It's already been posted.
RUN A SEPERATE MIC!!!!
My typical vocal mic is an AKG 414 through a Vintech 1272 directly into a Delta 1010.
Then I toss an extra mic (everyone has at least 2 mics), if not go pick up a $20 mic on Musician's Friend. Run the mic into your board. If you want to compress it, then compress it.
This method also allows you to use eq for the monitor mix without effecting the recording signal.
Brandon