i think 5k is the stock color for jdm tegs plus the crystal white is just clean(thats the color 5k is) i think they may have a slight blue tint to them but idk yet i dont have them when i bought my the front end was already converted and the guy just put the reg yellow lights in the headlights
just look at some different colors and pick what you like its your car you should get what you want and most hid companies have charts on their page that shows what the lights will look like
and i found some hids for like 50 a set if i find the page again ill let you know so you can check em out, supposedly theyre not too shabby