I'm a big believer in UV* LEDs for growth, it's true that they will look dimmer to us in person and don't really affect the colour of the tank (they do a little for fluorescing corals but royal blues already take care of this in a much more efficient way) but if you were to look up the spectrums at which photosynthesis occurs you will see that it is utilized in areas such as Chlorophylla a.
*Note that when I talk about UV I really mean violet in the 410-420 area such as rapidled's, I know UV is under 400 so hush hush!
This is also why you can't really find good 'true' UVs ($$ too) but it is still unknown how damaging UV can be to corals so I wouldn't' want too add too much true UV any ways.
As for the royal blues, this was the colour that was most accepted by everyone as the 'blue' to use and now is a staple in every LED build, they have a good spectrum and look to them (Then again every place has a different name and spectrum for their blues, RB tends to be the 450 area where blue is 460-470 looking at major distributors).
Now whites on the other hand are not really here for a specific spectrum but their looks. Cool white with RB has been the usual for a while but some have been experimenting because the combo tends to give a purple tint to it so what has been found was that Neutral white has a warmer spectrum and has a nicer look. The warmer spectrum is nice because we can get closer to the warmer side of chlorophyll a and b that photosynthesis uses too but people don't tend to like the really warm look the warm whites give, just too much, so for moderation neutral whites are starting to be popular as well as some reds (and cyan but that's another discussion
).
aaannnnnnnd... that's my rant!
As for Saltys build I think you will really like the look of the heatsinks when done, I have 2 of those guys butt up against each other and it looks really nice. The wires are all hidden in the corner where the sides drop for the splash garde so no messy wires. Best of luck with the re-build