Are the 4-5 inch Peru Monos from Massive Aggression? If so, good luck ordering. I tried to order these, but haven't gotten a response for days. Needless to say, I won't ever be giving this guy business.
IMO, one of the coolest Cichla is Kelberi. Azuls are nice. So are Orinos and Monos. Hell, they are all sweet! I think a few vendors on here are carrying Orinos. I think Sharkaquarium has Azuls. Just do research. See what would work best in your sized tank and what you like the look of best.