I dont disagree with a single comment stated here, just wanted to add my .02
I really have enjoyed the Outer Orbit Pro 24". It only has the 150w MH, so no ballast required. The main reason i chose this fixture was that i do not have a canopy and I did not want big ole' metal reflectors hanging in my living room. My wife would freak. The outer orbit really does have a sleek, clean feel to it, and I really enjoy the overall look it brings to my tank. The stock lights are crap, so i would suggest find a used fixture and replace all the used lights to your liking.
Good Luck!