3-Color LEDs - What Style?

[smallbearelec]

Someone asked me to find, and I have done a little homework. I can easily get 5mm RGB, common cathode or common anode and either diffused white or water clear lense. Any help with what combination would be most useful? Price for small quantities would be about $ .75 each.

[DavenPaget]

5mm RGB , common cathode , both diffused white and water clear lens would be good .