Ahhh, my favorite brand for silvers! Reading the above responses should indicate to you there is no one "hot" color. Some good rules of thumb have already been given.

As to me personally, water that is low and clear to perfect height and color, far and away my best size and color has been #3-4 metallic blue body/silver blade. In higher, off-color water, #5 metallic blue, chartreuse or flame body/silver blade have been the ticket. Don't rule out all silver, all gold and all copper finishes either as wild card offerings.