Hiya! I was just about to post something about cherry barbs and I saw yours and thought I'd pass on my experience! I have 2 males and 2 females in with danios and corys. One of my males has turned into a tiny terror. I've only had them about 6 weeks but he has taken over the tank (all 96 ltrs of it!). Not content with bullying the other 3 cherry barbs so that he 'owns' 7/8ths of the tank he has now turned his attention onto the corys, chasing them out of 'his' tank and pining them into a corner. Obviously he hadn't read the books that say they're peaceful with other fish!
So I'd suggest not getting another male and concentrating on a few females for yours. It would be sad if by introducing another male you tipped one of them into becoming such a nasty little specimin. I'm now having to consider buying another tank to house him because he's making life so miserable for everyone else!
best wishes
Minkymaid