Welcome to Reef Sanctuary...
I have a 75 gal DAS with 2 250w MH 10000K and 2 110w VHO actnics. That means I have 6.66 w/gal of daylight supplemented with 2.93 w/gal of actnics. Depending on what you kind of corals (sps,lps,softies...ect) depends on what lighting options you have. Champion Lighting has a retro with 2 VHO's with 80 wats of lights for 210.00. you could get one daylight and 1 dual daylight/actnic....which would give you aprox 6 w/gal of day light and about 2 w/gal of actnic.....Just a thought
Bill