I'm not sure what wattage you are trying to stay under but a tank that size is probably going to use quite a bit of energy.
If it were mine I would go with....
4x 400w Radiums on full luminarc reflectors with specd ballast, 4x 5' VHO super actinics, and 4x 5' T5 blue plus bulbs.
My tank is a 8'x3'x2'H
I run 4x Radium 20k 250w Halides, 4x 54w Blue+ T5s, and 2 160w URI Super Actinic 03 VHOs over my tank.... color is great. Corals really pop.