There's a lot of options you can go with, here are a few-
1) Coralife Aqualight: 260w PC, built-in fans, no need for hood, questionable reflectors and ballasts-but people have had great success with them.
2) AHSuplly 4x55w: Great ballasts and reflectors, but reflectors tend to confine light to the area right under it...may need to "unwind" the parabolic reflector to get more spread.
3) T5: Can be used with Workhorse ballasts(cheaper) or any electronic ballast, special made relfectors are great(parabolic shape, but more wide spread), more effecient then PC due to shape-no restrike, less heat and takes up less space. Cheaper in the long run.
4) ODNO: Needs electronic ballast, least effecient out of all of them, lots of heat output, very intense, cheap method of lighting.
Hope this helps!