Yea other schooling fish are okay, just nothing with fancy tails/fins. I wouldn't do Cichlids that get too big... (firebellies) Not a lot of people recommend doing cichlids with tiger barbs, but there are anomolies so do it at your own risk

To be honest, if your tank has room for more fish, I would just keep 10+ tiger barbs in your tank, the bigger the shoal the better. a lot of places recommend 5-8 tiger barbs, which is BS in my opinion because they are much more exciting to watch in a large group and it gaurantees that they dont bother your other fish. plus on the bonus they will start their own gangs within the shoal and then it gets real juicy!