Easiest way to go ? Fish only tank use the light came with the tank. Corals, bubble tip frags - use Very High Output (VHO) lights totaling 350 watts at least for a 75G tank more the better. Florescents run cooler but you have to change bulbs more frequently. Metal halide lights duplicates the effects of the sun. Just look at a tank with VHO and one with Metal halide - the metal halide can cast shadows of the water rippling like on the reef in a ocean VHO can't. And it's not for just looks they put out more light than florescents.
I'm for Metal halide because after starting with HO then VHO I still end up going for the Metal halide.