For me it has to be lemons. I love their shimmery colouring and the way they display to each other. They can get really shirty one minute then follow each other all over the tank the next
Having said that I think, for effect alone, rummies are great in large shoals.
Thanks for the response Lemons were my first choice, only thing im a little worried about now is all research says they get to around 2inches, thats quite big for my little 80l if they were to stay around the size they are in my lfs id be fine (similar to the ones in your pictures). We'll see