i dont know about the others but if your getting cory cats you may want to get a group of at least 5-6 they need some members of the same kind to be really active and to feel comfortable... and its funny to see them pile on each other when they are eatting
Yea, it seems like you are going to have that thing pretty well stocked and or over stocked. Maybe you could get something a little bigger or cut out something like the tiger barbs and get 2 more cories instead.