what do you ultimately plan on keeping?
fish only? SPS and clams?
different inhabitants require different lighting
I have a 72g Bowfront and this is how my lighting scheme went:
started with a Coralife 2x65w Powercompact fixture . . .
quickly realized this was practically useless for anything other than a fish only tank . . .
bought a 48" Coralife Aqualight Pro w/ 2x 150w Metal Halides and 2x 96w Actinic . . . for the most part i liked it, but a few months later decided the 150's werent cutting it . . .
so i got 2 Reef Optix III's with 250w Phoenix bulbs running on a Blue Wave VII ballast . . .
thats what im running now and am very pleased with the results- my corals have started to grow a lot better than with the other fixtures . . .
the moral of all this? do your research and BE SURE you know what you want- if the halides are something you think you MAY want in the future- save up the extra money and get em the first time, that way you're not losing money trying to sell the fixtures . . .