The Brain for sure.  Who better than a megalomaniacal mouse who has been the subject of scientific experiments and is bent on world domination.  Seems a perfect fit for biopharm.  He's got my vote.  He should maybe even take over for Leo.........for just a little bit, until the SP reflects all of CTIX's potential.

Also, my favorite Anamaniacs quote has always been "Early to rise, early to bed, makes a man healthy but socially dead."