I am doing the AIO lagoon with work travel the wife doesn't want to worry about the sump and stuff so not the footprint of the EXT but close. Still look more mixed reef than SPS dominated.I have this on the 50 gallon lagoon that i am setting up. I happened to have added two reefbrites and two kessil 160's as well--but that is way over kill. lol. The build thread in on reef2reef.
If i did all LED it would probably be the ATI Stratons... Who could duplicate t5's better??? No fans, super thin and low profile...
But radions and probably Skys (we don't know what led spectrums is though yet...) or a few kessils would be good too. I always have kessils in the mix because i love the shimmer and light they produce the best.