I'm not sure between the danios and the skirt tetras. I'm afraid the tiger barbs would be too nippy to the rest of the tank. I actually went and looked at some this weekend, but none of my LFS have a lot of them in stock right now. I may venture over to the "good" Petsmart and see what they have. I don't usually buy fish from the chain stores, but this one takes particularly good care of their fish.
Bettas: Roland, Belle, Snow White, Polo, Elise, and Titan. | 120 gallon community tank | 55 gallon angelfish tank | 20 gallons of guppies