good choices, and definitely,IMO, not overstocked, the chromi are great schooler, the only thing is getting them to live to your aquarium, if they make ti that far, they do rather well and are easy to keep(most die in shipping, either to the lfs, or your tank, but after that), they will also add plenty of activity to your tank
why don't you also get a pair of perculas, instead of one, and the kole's tang, gotta love em, they are socute(as my wife says), they are much more interesting looking in person than in pics