That's a good pick and actually what I was gonna recommend. It's gonna be nice and bright. One thing you want to watch out for is photo shock. There is a HUGE difference in intensity from what you have now. Consider leaving 2 bulbs out for the first two weeks. Go with 1 white/1 blue (actinic). Then after two weeks, add another actinic. Wait two weeks then add the last white. I don't mean to be insistant, but too much of a good thing real fast can kill the corals. They have gotten used to low intensity with what you currently have and might recess or bleach if you throw on a 4 bulb high intensity feature right away.
Good choice though.
where's me money