Im going to go against the grain with what everyone else said, if money is not an option. Go with Metal Halide. You may have to invest in a chiller, and you will definitely have higher power bills. But with that being said, MH seems to still be the best for coral growth IMO, and I am one of those on this site with a DIY LED fixture. While I agree, they are less to have overall, the coral growth isnt up to what I would like to see. If it were a FOWLR system, LED definitely. If you want great coral growth and color, go with Halides. I think LED is the next step, and I will use LED on my 180 upgrade but only because its more affordable for me. I live in Alabama so my AC is always running anyways, no sense in adding more heat with halides. I look at it this way, I think what LED lacks is UV... Think of it this way, How many tanning beds have LED lights in them? You cant get a tan with Leds because there is no true UV bulbs (yet) and I thoroughly believe UV has a lot to do with the success of most tanks lit by T5 or MH. Just my 2 cents, you really cant go wrong either way as all 3 have proven to be suitable for reef tanks.