this is what i do:
small white insert = one white led flat top or frosted
big white insert = 3 white leds
small color insert = 3 leds same color
big color insert = 3, 4, or super (go with the size of the insert) same color
G.I,
i tried the cool white 2 leds from cointaker and look great.
or i use 4 leds or super.
in the end it's a matter of taste and color.