To add to Bob's tips, if you do end up boosting (which I agree with him is not recommended practice), dial the Q down so it's not so narrow. Narrow cuts work well, narrow boosts are usually a bad idea from a sound quality standpoint. Try it yourself and you'll hear the difference. You can apply a fairly broad boost successfully without it 'honking'. This idea is found in lots of tip forums - here is one link that summarizes things fairly well: http://www.hometracked.com/2008/02/07/vocal-eq-tips/

Also, you will probably want to high-pass filter everything with a cutoff between 80 and 200 Hz - adjust to taste. Do the cutoff frequency adjustment while auditioning the vocals against the other elements of your mix. Dial up the cutoff frequency until the vocal sounds 'thin', then dial down the high pass cutoff frequency just a hair from wherever that 'thin' point is.

That article addresses high pass filtering to some extent, without getting into the method of where to set the cutoff frequency.

Bob, is there a parametric EQ in RB/BIAB? I don't recall there being one. I'm not sure where to buy one either. I use the one that's shipped with my DAW software. Long ago, I bought a parametric EQ DX plugin from the maker of N-Track, even though I don't use N-Track.

There are a few available in the freebie part of the plugin database but I don't have any experience with any of those that are there.

easy to use high pass filter available here:
http://www.gvst.co.uk/downloads.htm