Pretty much any of the SA/CA brutes would make a great wet pet. I'm partial to the oscar, but you can't miss with rds, or texas. Jd's and gts are good, but take a bit longer to warm up ime.
I have a Trimac in a 75 and they are a great fish. Another great fish to look into is a synspilum. Great looking peaceful fish with a very playful attitude. I have a trio of them and they are one of my top picks.