Recently I drilled a Brutal Nightmare , Diva and a Misfit Pearl . I guess the question I have is what do you guys suggest would be a good fit between the Brutal and the Diva ? I'm thinking a Marauder Madness or a Hellraiser Terror but I'm not entirely sure which would be more beneficial overall . 

Every thing Ive seen says Diva is more than the Madness, is changing the surface of the Diva an option? Move left?

I agree with the Marauder Madness being a gap filler with your arsenal. The solid cover will allow you to change it to match up better on many different conditions. Plus, it takes well to rough buff or polish.

The Diva is moreso designed to give you flip. More surface would smooth the reaction, giving you a Madness look anyways. The better option, IMO, is to get a Madness and then if its not enough, you can add surface with a solid cover more capable of handling oil. No use paying for a ball that flips (and I'm not saying its a flip monster) and adding surface to smooth the reaction, when you can pay the same price and get the reaction you are looking for.