You won't like the Iwasaki. The corals tend to change to dark greens and browns, although they grow corals very well they don't have the look you want unless you suppliment a bunch of actinic. Radiums have been getting good reviews and Dr. Mac, which everyone seems to like uses them on his tanks. The commercial ballast will overdrive the bulbs and make them more white than the yellow, but I would still run the radium. One light will work placed over the middle and the shaded areas on the sides can be used for brains, mushrooms, and other corals needing less light.
Tim Marvin
(512) 336-7258