As stated, none are "glassbangers"; however, full grown regani are insanely gorgeous.
For a single specimen tank, argentea are your best bet in terms of aggression.
Beautiful fish- rivaling regani imo. I've heard that they can be very aggr3ssive to tankmates but I cant speak on their level of interaction with their owners.
My experience with bocourti is that they're oscarish- begging for food and always in your face when you approach the tank. I'd expect the same of pearsi, only bigger.
Have you considered a male hait?