When I recently built my LED fixture, I read through that nano reef thread mentioned above. They recommended having all four main colours, rb, nw, cw and normal blues. If going with one colour of white, they recommend nw's over cw's, with the nw's and rb's in a 1:2 ratio. Not sure how important it is to have nw's over the cw's but supposedly you get a wider spectrum that way.
The normal blues are more of a baby blue colour (whereas rb's are slightly purple) and I've noticed some corals pop more with the blues on as well. You only need a few of them, as they are very overpowering and easily give the whole tank a baby blue colour (unless you like that colour).
The misc. colours (cyan, red, violet, etc) seemed too difficult to add in effectively as the drawbacks seem to outweigh the benefits. Adding those in might be overkill IMO.
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