http://www.reefgeek.com/lighting/T5_Fluorescent/

All of the lights you will find there are good manufacturers. They all use single lamp reflectors (SLRs) and are very good. I honestly would go with one of those three (other than the retro on that link) and you would be more than happy. SERIOUSLY SAVE FOR A FIXTURE LIKE THOSE IF YOU NEED TO! 6 or 8 bulb configuration would be what you want. I have a 6 bulb T5 over my 40g breeder frag tank.

The biggest thing you dont want to scrimp on is lighting. Filtration has taken a back seat with the design of the Reef Octopus line of skimmers.