Yep, still running the RapidLED kit, with a few tweaks to the LED selection (which was one of the reasons I went with the DIY kits, simple to replace LEDs to try out new/custom combinations and add new LEDs when the technology updates).
Radium and UVL SAs? That's a lot of 420! I only used my 4x110w UVL SAs when running 10k XMs and 10k Reeflux bulbs on my old 120. They did make the tank glow like nothing I have seen to date. I remember that with just the VHOs, the tank was actually pretty dark blue (even with 4 bulbs on), but all you would see is GLOW from the corals.
With my Royal Blues on (I believe one of the darker blue LEDs) only, it is still pretty bright blue, but with plenty of actinic pop. You can tell it still has wider spectrum than the old SAs because you can see everything in the tank in "medium blue". I've heard some zoanthid-nuts or other actinic-addicts will run their tanks on ONLY Royal Blue LEDs. I don't think you could even do that with the old SuperActinic bulbs, there just wasn't enough non-blue for things to survive, where as with LEDs, Royal Blue are the primary PAR providers (something different than any other lighting source).
Anyway, good luck with the new build, if you have any questions or ideas you'd like to bounce off of me, feel free to start a thread and PM me the address, or just PM, or comment here. Thanks for stopping in!