I just got 2 of the Aqualight Pro from Coralife (150 MH, 2x65 actinic PC, and moon in one fixture). I temporarily put them over my 75 and they looked awesome (I currently have 4x65w PC 50/50 on my 75). I bought the new lights for over my new tank, and I'll be buying two more (I am upgrading to a 350g). If you are keeping softies and LPS (as am I), these lights are awesome. Coralife is coming out with the same fixture in a 250 MH, but not for a few months. If you think you need the higher wattage in the MH, wait a few months. If not, go with the 150s. You are in the same boat as me....even the 150s are a HUGE improvement over the PCs. Plus they look nice over the tank - everything in one fixture, very clean.