If the only thing getting a FRFR speaker will give me is an increase in volume then maybe Im barking up the wrong tree and should just stick with my monitors I currently have.
Mhhh... well, I didn't just said that, actually. If the cab you would end up buying was more linear than your monitors you would have a better overall response. For example, they might be lacking in the lower frequency region, or elsewhere, or whatever...
I guess the point is: if you want to go the "linear" route, then buy the most linear cab you can afford
OTOH, if you are really looking for "the punch", I'd renew my advise about looking at an FR cab: you might get great satisfaction from it, and keep your monitors for listening to music, mixing and the like.