Dont buy orange or yellow Leds, waste of time, use bright white under these insert colours and u cant go wrong.
Red for red, purple for purple, green for green, white for clear and so on. Somebody else said pinball-life and i have gone that way as well, always in bulk.

G.I lighting is great to do with bright white, i never bother with flashers, no need unless u want to go from white to a colour. Ghost roms are avail ofcourse, machine dependant.  Have fun with it.