My system is 60" X 32" X 32" (266 gal). I did the same research you are doing now. My choice, 2-250W 6500K Iwasaki with spider reflectors and 2-96W Power Compact actinics. Go to Aquarium Frontiers archives and look for Sanjay Joshi article on 250W and 400W metal halides, the best one yet.