4 250w Halides would do nicely. I use the Plusrite Halides, never had any trouble with them. But the recommendations are going to be based off what you are planning on keeping in there. I have 2 Halides over the outter section of mine and LED's in the center, the Halides I use are 175w, but I don't intend on getting any SPS or clams. So 3 lights are plenty if your not going full blown Reef. 250w would get you the light penetration for SPS and clams, if you kept them under the lights and not in the corners that the light would not hit all the way, if using 3 halides.