Daniel411: I think you stocking list sounds good, all added slowly, and perhaps a few less damels. I say that because all the messy (small) food you'll be feeding the tangs and damsels, in addition to the waste produced by the sharks, could put quite a strain on your bio filters. That's just my opinion though. It could work out just fine.
I dont think you'll have any problems with, or have to quickly replace the damsels. The leopards will only pick off the sick or injured ones. I dont think they'll hunt them down much. Not saying it cant happen though.