i think those colors are pretty hard to breed. i know purple is. but, i've seen a pink fella. he was lovely. on bettysplenens, actually. i've seen orange, and yellow, though. never green, or that shade of blue.
Neon green in my opinion would be #1, when you think neon you think green, like green glow in the dark. The other colors are very nice, but green would stand out in any aquarium!