Al, I kept CA/SA cichlids for many years before getting into discus. If you want to house 1 big fish in a big tank...Dovii (Wolf Cichlids) have always been the king in the scene IMO.
The main thing to keep in mind with aggressive/preds is size, the biggest drawback for me keeping them was footprint...most of these angry interactive fish need space to grow to their potential and thrive.
The fish I enjoyed keeping most, would have to be Amphilophus labiatus (Red Devil). They grow to a manageable size AND FAST, I've had some that would go for my hand during water changes, and I had some that were puppy dogs, most I've had were super interactive.
TLDR - IMO you should decide on how big of a tank you would be willing to devote to them, and choose your options accordingly (If you'd like some suggestions, just let me know )